Exim 4.87 emails not being delivered right away

[Desai, Jason]

I tried sending this earlier, but I do not see that it made it to the list - resending again ....

I ran into an issue where emails would go through the mail scanner, but they would not be delivered with exim right away.  It would not be until the queue runner process would get to the emails in the out queue that they would finally get delivered.  Running MailScanner in debug mode would show "exim: can't get the current working directory".  Looking at the source code for Exim I saw that it tries to get its current working directory, and fails if there is an error.  (This code was added in version 4.87.)  That made me think that perhaps MailScanner changed to a temporary folder, started Exim to deliver the messages (with sendmail2), and then removed that temporary folder before Exim had a chance to initialize or deliver the emails.

I changed MailScanner to not try to deliver in the background, and the issue went away.  So then I put that back, and updated the Exim.pm code to change to a specific folder before attempting the Exim delivery, and that seemed to fix the issue.  I don't know if MailScanner depends on the working directory not getting changed anywhere - if it does, hopefully someone will let me know.  I am running MailScanner 4.85.2-3.  I did not see any similar change since that version.  Here is the change I made:

===============================================
--- Exim.pm.old 2015-02-28 12:18:33.000000000 -0500
+++ Exim.pm     2016-08-17 16:39:58.000000000 -0400
@@ -1119,6 +1119,7 @@
     my $idlist = join(' ', @ThisBatch);
     $idlist .= ' &' if MailScanner::Config::Value('deliverinbackground');
     #print STDERR "About to do \"Sendmail2 -Mc $idlist\"\n";
+    chdir MailScanner::Config::Value("incomingworkdir");
     system(MailScanner::Config::Value('sendmail2') . ' -Mc ' . $idlist);

     #JJH # JJH's version
===============================================

If it is useful, can you please include it in the source?  Thanks.

Jason




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