--- loncom/interface/lonmsgdisplay.pm	2019/08/06 17:53:56	1.181.2.2
+++ loncom/interface/lonmsgdisplay.pm	2025/01/29 09:11:10	1.202
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Routines for messaging display
 #
-# $Id: lonmsgdisplay.pm,v 1.181.2.2 2019/08/06 17:53:56 raeburn Exp $
+# $Id: lonmsgdisplay.pm,v 1.202 2025/01/29 09:11:10 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -111,6 +111,7 @@ use Apache::loncommunicate;
 use Apache::lonfeedback;
 use Apache::lonrss();
 use Apache::lonselstudent();
+use Apache::lonenc();
 use lib '/home/httpd/lib/perl/';
 use LONCAPA qw(:DEFAULT :match);
 
@@ -228,41 +229,39 @@ function folder_choice(targetform,caller
 <form method="post" action="/adm/email" name="folderlist">
    <div class="LC_columnSection"><fieldset>
    <legend>'.&mt('Folder Actions').'</legend>
-   <table border="0" cellspacing="2" cellpadding="8">
-    <tr>
-     <td><b>'.$html_lt{'fold'}.'</b><br />'."\n".
-         &Apache::loncommon::select_form($folder,'folder',\%formhash).'
-     </td>
-     <td><b>'.$html_lt{'show'}.'</b><br />'."\n".
+   <div class="LC_columnSection">
+     <div class="LC_mail_actions"><label><b>'.$html_lt{'fold'}.'</b><br />'."\n".
+         &Apache::loncommon::select_form($folder,'folder',\%formhash).'</label>
+     </div>
+     <div class="LC_mail_actions"><label><b>'.$html_lt{'show'}.'</b><br />'."\n".
          &Apache::loncommon::select_form($env{'form.interdis'},'interdis',
-					 \%show).'
-     </td>
-     <td><b>'.$html_lt{'status'}.'</b><br />'."\n".
-       &Apache::loncommon::select_form($msgstatus,'msgstatus',\%statushash).'
-     </td>
-     <td style="padding-right: 40px;">
-         <b>'.$html_lt{'actn'}.'</b><br />'."\n".'
+					 \%show).'</label>
+     </div>
+     <div class="LC_mail_actions"><label><b>'.$html_lt{'status'}.'</b><br />'."\n".
+       &Apache::loncommon::select_form($msgstatus,'msgstatus',\%statushash).'</label>
+     </div>
+     <div class="LC_mail_actions" style="padding-right: 1em">
+         <label><b>'.$html_lt{'actn'}.'</b><br />'."\n".'
          <span class="LC_nobreak">'.
-         &Apache::loncommon::select_form('view','folderaction',\%actions).
+         &Apache::loncommon::select_form('view','folderaction',\%actions).'</label>'.
          ' <input type="button" value="'.$html_lt{'go'}.
          '" onclick="javascript:folder_choice(this.form,'."'change'".');" />
          </span>
-     </td>
-     <td style="border-left: 1px solid;padding-left: 40px;">
-         <b>'.&mt('New Folder').'</b><br />'."\n".'
+     </div>
+     <div class="LC_vertical_line" style="padding: 0; height: 4em; margin: 0">
+     </div>
+     <div class="LC_mail_actions" style="padding-left: 3em">
          <span class="LC_nobreak">
-         <input type="text" size="15" name="newfolder" value="" />
+         <label><b>'.&mt('New Folder').'</b><br />'."\n".'
+         <input type="text" size="15" name="newfolder" value="" /></label>
          <input type="button" value="'.$html_lt{'go'}.
          '" onclick="javascript:folder_choice(this.form,'."'new'".');" />
          </span>
-     </td>
-    </tr>
-   </table>
+     </div>
    </fieldset></div>
 '."\n".
     '<input type="hidden" name="sortedby" value="'.$env{'form.sortedby'}.'" />'.
-    '<input type="hidden" name="renamed" value="" />'.
-        ($folder=~/^critical/?'</form>':'');
+    '<input type="hidden" name="renamed" value="" />';
     return $output;
 }
 
@@ -782,25 +781,29 @@ sub groupmail_header {
     if ($grouppagelink) {
         &Apache::lonhtmlcommon::add_breadcrumb
             ({href=>$grouppagelink,
-              text=>"Group: $description",
-              title=>"Go to group's home page"},);
+              text=>&mt('Group').": $description",
+              title=>&mt("Go to group's home page"),
+              no_mt=>1,
+             },);
     } else {
         &Apache::lonhtmlcommon::add_breadcrumb
-            ({text=>"Group: $description",});
+            ({text=>&mt('Group').": $description",
+              no_mt=>1,});
     }
-    &Apache::lonhtmlcommon::add_breadcrumb
-         ({href=>"/adm/email?compose=group&amp;group=".
-                 "$env{'form.group'}&amp;$refarg",
-           text=>"Send a Message in a Group",
-           title=>"Compose Group Message"},);
+    &Apache::lonhtmlcommon::add_breadcrumb   
+          ({href=>"/adm/email?compose=group&amp;group=".
+                     "$env{'form.group'}&amp;$refarg",
+               text=>"Send a Message in a Group",
+               title=>"Compose Group Message"},);
     if ($action eq 'sending') {
             &Apache::lonhtmlcommon::add_breadcrumb
                          ({text=>"Messages being sent.",
                            title=>"E-mails sent"},);
     }
     my $groupheader = &Apache::loncommon::start_page('Group Message');
-    $groupheader .= &Apache::lonhtmlcommon::breadcrumbs
-                ('Group - '.$env{'form.group'}.' Email');
+    $groupheader .= &Apache::lonhtmlcommon::breadcrumbs(
+                                    &mt('Group messages - [_1]',$description),
+                                                        undef,undef,undef,undef,1);
     return $groupheader;
 }
 
@@ -861,7 +864,7 @@ sub discrit {
                       .&Apache::lonhtmlcommon::row_closure(1);
         }
         $result .= &Apache::lonhtmlcommon::row_title(&mt('Message'),undef,'LC_evenrow_value')
-                  .'<pre>'.&Apache::lontexconvert::msgtexconverted($content{'message'}).'</pre>'
+                  .'<pre class="LC_wordwrap">'.&Apache::lontexconvert::msgtexconverted($content{'message'}).'</pre>'
                   .&Apache::lonhtmlcommon::row_closure()
                   .&Apache::lonhtmlcommon::row_title('',undef,'LC_oddrow_value')
                   .'<div class="LC_warning">';
@@ -908,7 +911,7 @@ sub discrit {
 }
 
 sub sortedmessages {
-    my ($blocked,$startblock,$endblock,$numblocked,$folder,$msgstatus) = @_;
+    my ($blocked,$startblock,$endblock,$by_ip,$numblocked,$folder,$msgstatus) = @_;
     my $suffix=&Apache::lonmsg::foldersuffix($folder);
     my @messages = &Apache::lonnet::getkeys('nohist_email'.$suffix);
     #unpack the varibles and repack into temp for sorting
@@ -940,7 +943,8 @@ sub sortedmessages {
 	    push(@temp1,$content{'recuser'},$content{'recdomain'});
 	}
         # Check whether message was sent during blocking period.
-        if ($sendtime >= $startblock && ($sendtime <= $endblock && $endblock > 0) ) {
+        if (($by_ip) ||
+            (($sendtime >= $startblock) && ($sendtime <= $endblock && $endblock > 0))) {
             $$blocked{$msgid} = 'ON';
             $$numblocked ++;
         } else { 
@@ -1067,7 +1071,9 @@ sub disfolder {
     my %blocked = ();
     my %setters = ();
     my $numblocked = 0;
-    my ($startblock,$endblock) = &Apache::loncommon::blockcheck(\%setters,'com');
+    my $clientip = &Apache::lonnet::get_requestor_ip($r);
+    my ($startblock,$endblock,$triggerblock,$by_ip,$blockdom) =
+        &Apache::loncommon::blockcheck(\%setters,'com',$clientip);
     my %js_lt = &Apache::lonlocal::texthash(
                       sede => 'Select a destination folder to which the messages will be moved.',
                       nome => 'No messages have been selected to apply this action to.',
@@ -1111,7 +1117,7 @@ sub disfolder {
 ENDDISHEADER
 
     my $fsqs='&amp;folder='.$folder;
-    my @temp=&sortedmessages(\%blocked,$startblock,$endblock,\$numblocked,$folder,$msgstatus);
+    my @temp=&sortedmessages(\%blocked,$startblock,$endblock,$by_ip,\$numblocked,$folder,$msgstatus);
     my $totalnumber=$#temp+1;
     if ($totalnumber < 1) {
         $r->print('<p class="LC_info">');
@@ -1124,9 +1130,10 @@ ENDDISHEADER
         }
         $r->print('</p>');
         if ($numblocked > 0) {
-            $r->print(&blocked_in_folder($numblocked,$startblock,$endblock,
+            $r->print(&blocked_in_folder($numblocked,$startblock,$endblock,$by_ip,$clientip,$blockdom,
                                          \%setters));
         }
+        $r->print('</form>');
         return;
     }
     my $interdis = $env{'form.interdis'};
@@ -1144,7 +1151,7 @@ ENDDISHEADER
     $r->print('<form method="post" name="disall" action="/adm/email">'.
 	      &Apache::loncommon::start_data_table().
           &Apache::loncommon::start_data_table_row().
-          '<th colspan="1">&nbsp;</th><th>');
+          '<th colspan="1">#</th><th>');
     if ($env{'form.sortedby'} eq "revdate") {
 	$r->print('<a href = "/adm/email?sortedby=date'.$fsqs.'">'.&mt('Date').'</a></th>');
     } else {
@@ -1223,10 +1230,10 @@ ENDDISHEADER
 		}
 	    }
             my $localsenttime = &Apache::lonlocal::locallocaltime($sendtime);
-	    $r->print('<td align="right"><span class="LC_nobreak">'.(($status eq 'new')?'<b>':'').
+	    $r->print('<td align="right"><span class="LC_nobreak"><label>'.(($status eq 'new')?'<b>':'').
                       $count.'.'.(($status eq 'new')?'</b>':'').'&nbsp;'.
                       '<input type="checkbox" name="delmark"'. 
-                      ' value="'.$origID.'" /></span></td>');
+                      ' value="'.$origID.'" /></label></span></td>');
             foreach my $item ($localsenttime,$dis_name,$dis_domain,$shortsubj) {
                 $r->print('<td>'.(($status eq 'new')?'<b>':'').
                           '<a href="/adm/email?display='.$origID.$sqs.'">'.
@@ -1264,16 +1271,15 @@ ENDDISHEADER
     $r->print('
 <div class="LC_columnSection"><fieldset>
 <legend>'.&mt('Message Actions').'</legend>
-<table border="0" cellspacing="2" cellpadding="8">
- <tr>
-  <td><b>'.&mt('Select Messages').'</b><br />
+<div class="LC_mail_actions">
+   <b>'.&mt('Select Messages').'</b><br />
    <span class="LC_nobreak">
    <input type="button" onclick="javascript:checkAll(document.disall.delmark)" value="'.&mt('Check All').'" />'."\n".
   ' <input type="button" onclick="javascript:uncheckAll(document.disall.delmark)" value="'.&mt('Uncheck All').'" />'."\n".
   '<input type="hidden" name="sortedby" value="'.$env{'form.sortedby'}.'" />
   </span>
-  </td>'."\n".
-  '<td><b>'.&mt('Action').'</b><br />'."\n".
+  </div>'."\n".
+  '<div class="LC_mail_actions"><label><b>'.&mt('Action').'</b><br />'."\n".
   '  <select name="checkedaction">'."\n");
 
     if ($folder ne 'trash') {
@@ -1292,7 +1298,7 @@ ENDDISHEADER
         $r->print('   <option value="markedmove">'.&mt('Move to Folder ->').
                   '</option>');
     }
-    $r->print("\n".'</select></td>'."\n");
+    $r->print("\n".'</select></label></div>'."\n");
 
     if (keys(%gotfolders) > 0) {
         $r->print('<td><b>'.&mt('Destination folder').'</b><br />');
@@ -1304,30 +1310,35 @@ ENDDISHEADER
         $r->print(&Apache::loncommon::select_form('','movetofolder',\%userfolders).
                   '</td>');
     }
-    $r->print('<td style="vertical-align:bottom;">'.
-              '<input type="button" name="go" value="'.&mt('Go').
-              '" onclick="javascript:validate_checkedaction()"/></td>'."\n".
-              '</tr></table>'."\n".
+    $r->print('<div class="LC_mail_actions">'.
+              '<br /><input type="button" name="go" value="'.&mt('Go').
+              '" onclick="javascript:validate_checkedaction()"/></div>'."\n".
               '</fieldset></div>'."\n"
     );
     my $postedstartdis=$startdis+1;
     $r->print('<input type="hidden" name="folder" value="'.$folder.'" /><input type="hidden" name="startdis" value="'.$postedstartdis.'" /><input type="hidden" name="interdis" value="'.$env{'form.interdis'}.'" /><input type="hidden" name="msgstatus" value="'.$msgstatus.'" /><input type="hidden" name="markedaction" value="" /></form>');
     if ($numblocked > 0) {
         $r->print(&blocked_in_folder($numblocked,$startblock,$endblock,
-                                     \%setters));
+                                     $by_ip,$clientip,$blockdom,\%setters));
     }
 }
 
 sub blocked_in_folder {
-    my ($numblocked,$startblock,$endblock,$setters) = @_;
-    my $beginblock = &Apache::lonlocal::locallocaltime($startblock);
-    my $finishblock = &Apache::lonlocal::locallocaltime($endblock);
-    my $output = '<br /><br />'.
+    my ($numblocked,$startblock,$endblock,$by_ip,$clientip,$blockdom,$setters) = @_;
+    my $output;
+    if ($by_ip) {
+        $output = '<br /><br />'.
+                  &mt('[quant,_1,message is, messages are] not viewable because display of LON-CAPA messages is blocked for your current IP address: [_2].',$numblocked,$clientip).'<br />'.
+                  &mt('Note: communication is being blocked for certain IP address(es).');
+    } else {
+        my $beginblock = &Apache::lonlocal::locallocaltime($startblock);
+        my $finishblock = &Apache::lonlocal::locallocaltime($endblock);
+        $output = '<br /><br />'.
                   &mt('[quant,_1,message is, messages are] not viewable because display of LON-CAPA messages sent to you by other students between [_2] and [_3] is currently being blocked because of online exams.',$numblocked,$beginblock,$finishblock);
+    }
     #$output .= &Apache::loncommon::build_block_table($startblock,$endblock,
     #                                                 $setters);
-    
-    my ($blocked, $blocktext) = &Apache::loncommon::blocking_status("com");
+    my ($blocked, $blocktext) = &Apache::loncommon::blocking_status("com",$clientip);
     $output .="<br /><br />".$blocktext;
 
     return $output;
@@ -1338,6 +1349,26 @@ sub blocked_in_folder {
 sub compout {
     my ($r,$forwarding,$replying,$broadcast,$replycrit,$folder,$dismode,
         $multiforward)=@_;
+    my $clientip = &Apache::lonnet::get_requestor_ip($r);
+    my %setters;
+    my ($startblock,$endblock,$triggerblock,$by_ip,$blockdom) =
+        &Apache::loncommon::blockcheck(\%setters,'com',$clientip);
+    if ($by_ip) {
+        my $showdom = &Apache::lonnet::domain($blockdom);
+        if ($showdom eq '') {
+            $showdom = $blockdom;
+        }
+        $r->print(&Apache::loncommon::start_page('Messages'));
+        $r->print(&Apache::lonhtmlcommon::breadcrumbs('Send and display messages'));
+        $r->print('<p class="LC_warning">'.
+                 &mt('Sending of LON-CAPA messages is blocked for your current IP address: [_1].',$clientip).'</p>'.
+                 '<ul><li>'.
+                 &mt('Note: communication is being blocked for certain IP address(es).').
+                 '</li><li>'.
+                 &mt('This restriction was set by an administrator in the [_1] LON-CAPA domain.',$showdom).
+                 '</li></ul>');
+        return;
+    }
     my $suffix=&Apache::lonmsg::foldersuffix($folder);
     my ($cdom,$cnum,$group,$refarg);
     if (exists($env{'form.group'})) {
@@ -1412,11 +1443,14 @@ sub compout {
                                        'to'   => 'To:',
                                       );
     my %attachmax = (
-                     text => &mt('(128 KB max size)'),
-                     num  => 131072,
+                     text => &mt('(1 MB max size)'),
+                     num  => 1048576,
                     );
     if (!$forwarding && !$multiforward) {
-        $attachrow = '<tr><td colspan="3"><b>'.$lt{'atta'}.'</b> '.$attachmax{'text'}.': <input type="file" name="attachment" /></td></tr>';
+        $attachrow = '<tr><td colspan="3"><b>'.$lt{'atta'}.'</b> '.$attachmax{'text'}
+            .': <input type="file" name="attachment" class="LC_flUpload" multiple />'
+            .'<input type="hidden" id="LC_free_space" value="'.$attachmax{'num'}.'" />'
+            .'</td></tr>';
     }
     if (&Apache::lonnet::allowed('srm',$env{'request.course.id'})
 	|| &Apache::lonnet::allowed('srm',$env{'request.course.id'}.
@@ -1971,7 +2005,7 @@ sub disfacetoface {
  &Apache::loncommon::plainname($content{'sendername'},$content{'senderdomain'}),$content{'sendername'},$content{'senderdomain'}).'</b> ('.
 $content{'sendername'}.':'.
             $content{'senderdomain'}.') '.$content{'time'}.
-            '<br /><pre>'.
+            '<br /><pre class="LC_wordwrap">'.
               &Apache::lontexconvert::msgtexconverted($content{'message'}).
 	      '</pre>';
      }
@@ -2099,14 +2133,16 @@ sub displaymessage {
     my %setters = ();
     my $numblocked = 0;
     my $crstype = &Apache::loncommon::course_type();
+    my $clientip = &Apache::lonnet::get_requestor_ip($r);
 
 # info to generate "next" and "previous" buttons and check if message is blocked
-    my ($startblock,$endblock) = &Apache::loncommon::blockcheck(\%setters,'com');
-    my @messages=&sortedmessages(\%blocked,$startblock,$endblock,\$numblocked,$folder,$msgstatus);
+    my ($startblock,$endblock,$triggerblock,$by_ip,$blockdom) =
+        &Apache::loncommon::blockcheck(\%setters,'com',$clientip);
+    my @messages=&sortedmessages(\%blocked,$startblock,$endblock,$by_ip,\$numblocked,$folder,$msgstatus);
     if ( $blocked{$msgid} eq 'ON' ) {
         &printheader($r,'/adm/email',&mt('Display a Message'));
         #$r->print(&mt('You attempted to display a message that is currently blocked because you are enrolled in one or more courses for which there is an ongoing online exam.'));
-        my($blocked, $blocktext) = &Apache::loncommon::blocking_status("com");
+        my($blocked, $blocktext) = &Apache::loncommon::blocking_status("com",$clientip);
         $r->print("<br />".$blocktext);
         return;
     }
@@ -2140,8 +2176,28 @@ sub displaymessage {
 
 
     my $number_of_messages = scalar(@messages); #subtract 1 for last index
+    my $head_extra;
+
+# if student's view of resource will be included
+# get <link> tag(s) for css file(s) in use, and pass to &header to include
+# in call to loncommon::start_page()
+
+    if (($env{'request.course.id'} eq $content{'courseid'}) &&
+        (&Apache::lonnet::allowed('vgr',$content{'courseid'}))) {
+        my $symb;
+        if (defined($content{'symb'})) {
+            $symb = $content{'symb'};
+        } elsif (defined($content{'baseurl'})) {
+            $symb=&Apache::lonnet::symbread($content{'baseurl'});
+        }
+        if ($symb) {
+            $head_extra = &Apache::loncommon::css_links($symb);
+        }
+    }
+
 # start output
-    &printheader($r,'/adm/email?display='.&escape($msgid),'Display a Message','',$content{'baseurl'});
+    &printheader($r,'/adm/email?display='.&escape($msgid),'Display a Message','',
+                 $content{'baseurl'},$head_extra);
 
 # Prepare available functions
     my @functionlist;
@@ -2445,12 +2501,16 @@ sub displaymessage {
                               $showsymb,$env{'user.domain'},$env{'user.name'});
                 if ($symb) {
                     if ($encrypturl =~ /^yes$/i && !$env{'request.role.adv'}) {
-                        $showsymb = &Apache::lonenc::check_encrypt($symb);
+                        unless ($showsymb =~ m{^/enc/}) {
+                            $showsymb = &Apache::lonenc::encrypted($showsymb);
+                        }
                     }
                     $symblink = '?symb='.$showsymb;
                 }
                 if ($encrypturl =~ /^yes$/i && !$env{'request.role.adv'}) {
-                    $showurl = $baseurl;
+                    unless ($showurl =~ m{^/enc/}) {
+                        $showurl = &Apache::lonenc::encrypted($showurl);
+                    }
                 }
                 $r->print(&Apache::lonhtmlcommon::row_title(&mt('Refers to'))
                          .'<a href="'.$showurl.$symblink.'">'.$restitle.'</a>'
@@ -2490,7 +2550,7 @@ sub displaymessage {
 
     # Message
     $r->print(&Apache::lonhtmlcommon::row_title(&mt('Message'))
-             .'<pre>'
+             .'<pre class="LC_wordwrap">'
 	     .&Apache::lontexconvert::msgtexconverted($content{'message'},1)
 	     .'</pre>'
     );
@@ -2644,12 +2704,20 @@ sub displayresource {
      && (&Apache::lonnet::allowed('vgr',$content{'courseid'}))) {
         my $symb;
         if (defined($content{'symb'})) {
-            $symb = $content{'symb'};
-        } else { 
-	    $symb=&Apache::lonnet::symbread($content{'baseurl'});
+            $symb = &Apache::lonenc::check_decrypt($content{'symb'});
+        } elsif (defined($content{'baseurl'})) {
+            $symb =
+                &Apache::lonnet::symbread(&Apache::lonenc::check_decrypt($content{'baseurl'}));
         }
 # Could not get a symb, give up
 	unless ($symb) { return $content{'citation'}; }
+        if ($symb =~ /ext\.tool$/) {
+            return '<h2>'.&mt('Current transactions for student (if applicable)').'</h2>'.
+            &Apache::loncommon::get_previous_attempt($symb,
+                                                     $content{'sendername'},
+                                                     $content{'senderdomain'},
+                                                     $content{'courseid'});
+        }
 # Have a symb, can render
 	return '<h2>'.&mt('Current attempts of student (if applicable)').'</h2>'.
 	    &Apache::loncommon::get_previous_attempt($symb,
@@ -2675,11 +2743,16 @@ sub displayresource {
 # ================================================================== The Header
 
 sub header {
-    my ($r,$title,$baseurl)=@_;
+    my ($r,$title,$baseurl,$head_extra)=@_;
     my $extra = &Apache::loncommon::studentbrowser_javascript();
     if ($baseurl) {
 	$extra .= "<base href=\"".&Apache::lonnet::absolute_url()."/$baseurl\" />";
     }
+    $extra .= '<script type="text/javascript"
+                src="/res/adm/includes/file_upload.js"></script>';
+    if ($head_extra) {
+        $extra .= "\n$head_extra";
+    }
     $r->print(&Apache::loncommon::start_page('Messages',
  					$extra));
     $r->print(&Apache::lonhtmlcommon::breadcrumbs
@@ -2689,11 +2762,11 @@ sub header {
 # ---------------------------------------------------------------- Print header
 
 sub printheader {
-    my ($r,$url,$desc,$title,$baseurl)=@_;
+    my ($r,$url,$desc,$title,$baseurl,$head_extra)=@_;
     &Apache::lonhtmlcommon::add_breadcrumb
 	({href=>$url,
 	  text=>$desc});
-    &header($r,$title,$baseurl);
+    &header($r,$title,$baseurl,$head_extra);
 }
 
 # ------------------------------------------------------------ Store the comment
@@ -2750,8 +2823,15 @@ sub sendoffmail {
         $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
         $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
     }
-    if ($env{'form.send'}) {
-        if (!$env{'form.multiforward'}) { 
+    my $clientip = &Apache::lonnet::get_requestor_ip($r);
+    my %setters;
+    my ($startblock,$endblock,$triggerblock,$by_ip,$blockdom) =
+        &Apache::loncommon::blockcheck(\%setters,'com',$clientip);
+    if ($by_ip) {
+        &printheader($r,'','Sending messages blocked from your location.');
+        return 'blocked';
+    } elsif ($env{'form.send'}) {
+        if (!$env{'form.multiforward'}) {
             if ($group eq '') {
 	        &printheader($r,'','Messages being sent.');
             } else {
@@ -2781,6 +2861,8 @@ sub sendoffmail {
 
 	my $mode = $env{'form.sendmode'};
 	my (%toaddr,$tos,$cc,$bcc,$broadcast);
+        my (%willtrust,%trustchecked,%disallowed);
+        my $serverdefdom = &Apache::lonnet::default_login_domain();
 
 	if ($mode eq 'group') {
             if (defined($env{'form.courserecips'})) {
@@ -2790,9 +2872,17 @@ sub sendoffmail {
                 foreach my $dest (@to) {
                     my ($user,$domain) = split(/:/, $dest);
                     if (($user ne '') && ($domain ne '')) {
-                        my $rec = $user.":".$domain;
-                        $toaddr{$rec} = '';
-                        $broadcast->{$rec} = '';
+                        unless ($trustchecked{$domain}) {
+                            $willtrust{$domain} = &Apache::lonnet::will_trust('msg',$serverdefdom,$domain);
+                            $trustchecked{$domain} = 1;
+                        }
+                        if ($willtrust{$domain}) {
+                            my $rec = $user.":".$domain;
+                            $toaddr{$rec} = '';
+                            $broadcast->{$rec} = '';
+                        } else {
+                            $disallowed{'to'}{$user.":".$domain} = 1; 
+                        }
                     }
                 }
             }
@@ -2803,22 +2893,47 @@ sub sendoffmail {
 		if ($txt) {
                     $rec =~ s/^\s+//;
                     $rec =~ s/\s+$//;
-		    $toaddr{$rec}.=$txt."\n";
-                    $broadcast->{$rec} = '';
+                    my ($recuname,$recudom) = split(/:/,$rec);
+                    unless ($trustchecked{$recudom}) {
+                        $willtrust{$recudom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$recudom);
+                        $trustchecked{$recudom} = 1;
+                    }
+                    if ($willtrust{$recudom}) {
+		        $toaddr{$rec}.=$txt."\n";
+                        $broadcast->{$rec} = '';
+                    } else {
+                        $disallowed{'to'}{$rec} = 1;
+                    }
 		}
 	    }
 	} else {
 	    if (($env{'form.recuname'} ne '') && ($env{'form.recdomain'} ne '')) {
-		$toaddr{$env{'form.recuname'}.':'.$env{'form.recdomain'}}='';
-                $tos->{$env{'form.recuname'}.':'.$env{'form.recdomain'}}='';
+                unless ($trustchecked{$env{'form.recdomain'}}) {
+                    $willtrust{$env{'form.recdomain'}} = &Apache::lonnet::will_trust('msg',$serverdefdom,$env{'form.recdomain'});
+                    $trustchecked{$env{'form.recdomain'}} = 1;
+                }
+                if ($willtrust{$env{'form.recdomain'}}) {
+		    $toaddr{$env{'form.recuname'}.':'.$env{'form.recdomain'}}='';
+                    $tos->{$env{'form.recuname'}.':'.$env{'form.recdomain'}}='';
+                } else {
+                    $disallowed{'to'}{$env{'form.recuname'}.':'.$env{'form.recdomain'}}; 
+                }
 	    }
 	}
         if ($env{'form.additionalrec_to'}) {
             foreach my $rec (split(/\s*,\s*/,$env{'form.additionalrec_to'})) {
                 my ($auname,$audom)=split(/:/,$rec);
                 if (($auname ne "") && ($audom ne "")) {
-                    $toaddr{$auname.':'.$audom}='';
-                    $tos->{$auname.':'.$audom}='';
+                    unless ($trustchecked{$audom}) {
+                        $willtrust{$audom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$audom);
+                        $trustchecked{$audom} = 1;
+                    }
+                    if ($willtrust{$audom}) {
+                        $toaddr{$auname.':'.$audom}='';
+                        $tos->{$auname.':'.$audom}='';
+                    } else {
+                        $disallowed{'to'}{$auname.':'.$audom};
+                    }
                 }
             }
         }
@@ -2828,8 +2943,16 @@ sub sendoffmail {
             foreach my $rec (@toreplies) {
                 my ($auname,$audom)=split(/:/,$rec);
                 if (($auname ne "") && ($audom ne "")) {
-                    $toaddr{$auname.':'.$audom}='';
-                    $tos->{$auname.':'.$audom}='';
+                    unless ($trustchecked{$audom}) {
+                        $willtrust{$audom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$audom);
+                        $trustchecked{$audom} = 1;
+                    }
+                    if ($willtrust{$audom}) {
+                        $toaddr{$auname.':'.$audom}='';
+                        $tos->{$auname.':'.$audom}='';
+                    } else {
+                        $disallowed{'to'}{$auname.':'.$audom};
+                    } 
                 }
             }
         }
@@ -2837,9 +2960,17 @@ sub sendoffmail {
 	    foreach my $rec (split(/\s*,\s*/,$env{'form.additionalrec_cc'})) {
 		my ($auname,$audom)=split(/:/,$rec);
 		if (($auname ne "") && ($audom ne "")) {
-                    $toaddr{$auname.':'.$audom}='';
                     if (!defined($tos->{$auname.':'.$audom})) {
-		        $cc->{$auname.':'.$audom}='';
+                        unless ($trustchecked{$audom}) {
+                            $willtrust{$audom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$audom);
+                            $trustchecked{$audom} = 1;
+                        }
+                        if ($willtrust{$audom}) {
+                            $toaddr{$auname.':'.$audom}='';
+		            $cc->{$auname.':'.$audom}='';
+                        } else {
+                            $disallowed{'cc'}{$auname.':'.$audom};
+                        }
                     }
 		}
 	    }
@@ -2850,9 +2981,17 @@ sub sendoffmail {
             foreach my $rec (@ccreplies) {
                 my ($auname,$audom)=split(/:/,$rec);
                 if (($auname ne "") && ($audom ne "")) {
-                    $toaddr{$auname.':'.$audom}='';
                     if (!defined($tos->{$auname.':'.$audom})) {
-                        $cc->{$auname.':'.$audom}='';
+                        unless ($trustchecked{$audom}) {
+                            $willtrust{$audom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$audom);
+                            $trustchecked{$audom} = 1;
+                        }
+                        if ($willtrust{$audom}) {
+                            $toaddr{$auname.':'.$audom}='';
+                            $cc->{$auname.':'.$audom}='';
+                        } else {
+                            $disallowed{'cc'}{$auname.':'.$audom} = 1;
+                        }
                     }
                 }
             }
@@ -2863,9 +3002,17 @@ sub sendoffmail {
             foreach my $rec (@groupreplies) {
                 my ($auname,$audom)=split(/:/,$rec);
                 if (($auname ne "") && ($audom ne "")) {
-                    $toaddr{$auname.':'.$audom}='';
                     if (!defined($tos->{$auname.':'.$audom})) {
-                        $broadcast->{$auname.':'.$audom}='';
+                        unless ($trustchecked{$audom}) {
+                            $willtrust{$audom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$audom);
+                            $trustchecked{$audom} = 1;
+                        }
+                        if ($willtrust{$audom}) {
+                            $toaddr{$auname.':'.$audom}='';
+                            $broadcast->{$auname.':'.$audom}='';
+                        } else {
+                            $disallowed{'to'}{$auname.':'.$audom} = 1;
+                        }
                     }
                 }
             }
@@ -2874,10 +3021,18 @@ sub sendoffmail {
             foreach my $rec (split(/\s*,\s*/,$env{'form.additionalrec_bcc'})) {
                 my ($auname,$audom)=split(/:/,$rec);
                 if (($auname ne "") && ($audom ne "")) {
-                    $toaddr{$auname.':'.$audom}='';
-                    if ((!defined($tos->{$auname.':'.$audom})) && 
+                    if ((!defined($tos->{$auname.':'.$audom})) &&
                         (!defined($cc->{$auname.':'.$audom}))) {
-                        $bcc->{$auname.':'.$audom}='';
+                        unless ($trustchecked{$audom}) {
+                            $willtrust{$audom} = &Apache::lonnet::will_trust('msg',$serverdefdom,$audom);
+                            $trustchecked{$audom} = 1;
+                        }
+                        if ($willtrust{$audom}) {
+                            $toaddr{$auname.':'.$audom}='';
+                            $bcc->{$auname.':'.$audom}='';
+                        } else {
+                            $disallowed{'bcc'}{$auname.':'.$audom} = 1;
+                        }
                     }
                 }
             }
@@ -2897,42 +3052,42 @@ sub sendoffmail {
         } else {
             $savemsg=&Apache::lonfeedback::clear_out_html($env{'form.message'});
         }
-        my %reciphash = (
-                           to => $tos,
-                           cc => $cc,
-                           bcc => $bcc,
-                        );
-        if ($mode eq 'group') {
-            if ($group eq '') {
-                $reciphash{'course_broadcast'} = $broadcast;
-            } else {
-                if ($env{'form.groupmail'} eq 'cc') {
-                    $reciphash{'group_cc_broadcast'} = $broadcast;
+        my ($recipid, @recusers, @recudoms, %permresults);
+        if (keys(%toaddr) > 0) {
+            my %reciphash = (
+                               to => $tos,
+                               cc => $cc,
+                               bcc => $bcc,
+                            );
+            if ($mode eq 'group') {
+                if ($group eq '') {
+                    $reciphash{'course_broadcast'} = $broadcast;
                 } else {
-                    $reciphash{'group_bcc_broadcast'} = $broadcast;
+                    if ($env{'form.groupmail'} eq 'cc') {
+                        $reciphash{'group_cc_broadcast'} = $broadcast;
+                    } else {
+                        $reciphash{'group_bcc_broadcast'} = $broadcast;
+                    }
                 }
             }
-        }
-        my ($recipid,$recipstatus) = 
-            &Apache::lonmsg::store_recipients($msgsubj,$env{'user.name'},
-                                       $env{'user.domain'},\%reciphash);
-        if ($recipstatus ne 'ok') {
-            &Apache::lonnet::logthis('Failed to store To, Bcc and Cc recipients for '.$env{'user.name'}.':'.$env{'user.domain'});
-        }
-        if ($env{'form.attachment'}) {
-            if (length($env{'form.attachment'})<131072) {
-                $attachmenturl=&Apache::lonnet::userfileupload('attachment',undef,'feedback/'.$now);
-            } else {
-                $r->print('<p><span class="LC_warning">'.&mt('Attachment not included - exceeded permitted length').'</span><br /></p>');
-            }
-        } elsif ($env{'form.multiforward'}) {
-            if ($env{'form.attachmenturl'} ne '') {
-                $attachmenturl = $env{'form.attachmenturl'};
+            ($recipid,my $recipstatus) = 
+                &Apache::lonmsg::store_recipients($msgsubj,$env{'user.name'},
+                                                  $env{'user.domain'},\%reciphash);
+            if ($recipstatus ne 'ok') {
+                &Apache::lonnet::logthis('Failed to store To, Bcc and Cc recipients for '.$env{'user.name'}.':'.$env{'user.domain'});
+            }
+            if ($env{'form.attachment'}) {
+                if (length($env{'form.attachment'}) <= 1048576) {
+                    $attachmenturl=&Apache::lonnet::userfileupload('attachment',undef,'feedback/'.$now);
+                } else {
+                    $r->print('<p><span class="LC_warning">'.&mt('Attachment not included - exceeded permitted length').'</span><br /></p>');
+                }
+            } elsif ($env{'form.multiforward'}) {
+                if ($env{'form.attachmenturl'} ne '') {
+                    $attachmenturl = $env{'form.attachmenturl'};
+                }
             }
         }
-        my @recusers;
-        my @recudoms;
-        my %permresults;
 	foreach my $address (sort(keys(%toaddr))) {
 	    my ($recuname,$recdomain)=split(/\:/,$address);
             my $msgtxt = $savemsg;
@@ -3070,6 +3225,23 @@ sub sendoffmail {
                 $r->print($message);
             }
         }
+        if (keys(%disallowed)) {
+            if ((ref($disallowed{'to'}) eq 'HASH') && (keys(%{$disallowed{'to'}}) > 0)) {
+                $r->print(&mt("The following recipients were excluded because the user's domain does not accept messages from server's domain:").'<ul><li>'.
+                          join("</li><li>\n",sort(keys(%{$disallowed{'to'}}))).
+                          '</li><ul><br />');
+            }
+            if (ref($disallowed{'cc'}) eq 'HASH') {
+                $r->print(&mt("The following CCs were excluded because the user's domain does not accept messages from server's domain:").'<ul><li>'.
+                          join("</li><li>\n",sort(keys(%{$disallowed{'cc'}}))).
+                          '</li><ul><br />');
+            }
+            if (ref($disallowed{'bcc'}) eq 'HASH') {
+                $r->print(&mt("The following BCCs were excluded because the user's domain does not accept messages from server's domain:").'<ul><li>'.
+                          join("</li><li>\n",sort(keys(%{$disallowed{'bcc'}}))).
+                          '</li><ul><br />');
+            }
+        }
     } else {
         &printheader($r,'','Messages cancelled.');
         return 'cancelled';
@@ -3095,9 +3267,24 @@ sub handler {
          'sendreply','compose','sendmail','critical','recname','recdom',
          'recordftf','sortedby','folder','startdis','interdis',
 	 'showcommentbaseurl','dismode','group','subject','text','ref',
-         'msgstatus']);
+         'msgstatus','btoken']);
     $sqs='&amp;sortedby='.$env{'form.sortedby'};
 
+# ----------- Check if access was from balancer to server with existing session
+
+    if ($env{'form.btoken'}) {
+        my %info = &Apache::lonnet::tmpget($env{'form.btoken'});
+        &Apache::lonnet::tmpdel($env{'form.btoken'});
+        delete($env{'form.btoken'});
+        unless ($env{'form.display'}) {
+            if (($info{'display'}) && ($info{'mailrecip'})) {
+                if (&unescape($info{'mailrecip'}) eq $env{'user.name'}.':'.$env{'user.domain'}) {
+                    $env{'form.display'} = &unescape($info{'display'});
+                }
+            }
+        }
+    }
+
 # ------------------------------------------------------ They checked for email
     &Apache::lonnet::put('email_status',{'recnewemail'=>0});
 
@@ -3352,8 +3539,12 @@ sub handler {
                 my $count = keys(%forwardfail);
                 my $message = &Apache::lonhtmlcommon::confirm_success(&mt('Could not forward [quant,_1,message].',$count),1);
                 foreach my $key (keys(%forwardfail)) {
-                    $message .= '<br />'.&mt('Could not deliver forwarded message.').'</span> '.
-                                &mt('The recipient addresses may need to be corrected').' ('.$forwardfail{$key}.')';
+                    $message .= '<br />'.&mt('Could not deliver forwarded message.').' ';
+                    if ($forwardfail{$key} eq 'blocked') {
+                        $message .= &mt('Sending messages is blocked from your IP address');
+                    } else {
+                        $message .= &mt('The recipient addresses may need to be corrected').' ('.$forwardfail{$key}.')';
+                    }
                 }
                 $message = &Apache::loncommon::confirmwrapper($message);
                 $r->print($message);