Christian Schoepplein wrote: The debug output is in apache error log. To enable it, just open Kernel/System/Email/SMTP.pm and insert in line 38 the following: $Self->{Debug} = 1000; So it should look like that after the change: ----- [...] # debug $Self->{Debug} = $Param{Debug} || 0; $Self->{Debug} = 1000; $Self->{Debug} = 10; if ($Self->{Debug} > 2) { [...] ----- My results: Same failure, but looking at the Apache error.log, this is the only error generated after making this change: [Fri Aug 18 08:02:25 2006] [error] [client 23.128.25.26] File does not exist: D:/OTRS/otrs/bin/cgi-bin/favicon.ico Weird that an email requires an icon file. A couple of "for my education please" questions - not really on the bug topic. I'm not sure why the $Self->{Debug} = 10; line was added here, doens't it replace the 1000 as the value of the variable? And why is this different than just putting the $Self->{SMTPDebug} = 1; statement outside the if statement as I did. Thanks again for your response. Keith