--- loncom/interface/lonmsgdisplay.pm	2017/03/15 20:58:12	1.184
+++ loncom/interface/lonmsgdisplay.pm	2017/08/07 20:22:13	1.185
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Routines for messaging display
 #
-# $Id: lonmsgdisplay.pm,v 1.184 2017/03/15 20:58:12 raeburn Exp $
+# $Id: lonmsgdisplay.pm,v 1.185 2017/08/07 20:22:13 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2756,7 +2756,7 @@ sub sendoffmail {
         $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
     }
     if ($env{'form.send'}) {
-        if (!$env{'form.multiforward'}) { 
+        if (!$env{'form.multiforward'}) {
             if ($group eq '') {
 	        &printheader($r,'','Messages being sent.');
             } else {
@@ -2786,6 +2786,8 @@ 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'})) {
@@ -2795,9 +2797,17 @@ 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.":".$domain} = 1; 
+                        }
                     }
                 }
             }
@@ -2808,22 +2818,47 @@ sub sendoffmail {
 		if ($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};
+                    }
                 }
             }
         }
@@ -2833,8 +2868,16 @@ 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};
+                    } 
                 }
             }
         }
@@ -2842,9 +2885,17 @@ 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};
+                        }
                     }
 		}
 	    }
@@ -2855,9 +2906,17 @@ 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;
+                        }
                     }
                 }
             }
@@ -2868,9 +2927,17 @@ 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;
+                        }
                     }
                 }
             }
@@ -2879,10 +2946,18 @@ 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;
+                        }
                     }
                 }
             }
@@ -2902,42 +2977,42 @@ 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'})<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'};
+                }
             }
         }
-        my @recusers;
-        my @recudoms;
-        my %permresults;
 	foreach my $address (sort(keys(%toaddr))) {
 	    my ($recuname,$recdomain)=split(/\:/,$address);
             my $msgtxt = $savemsg;
@@ -3075,6 +3150,23 @@ 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';