Are you running mod_perl or FastCGI? If fastcgi, mod_fcgid, mod_fastcgi, or something else?
mod_perl
Can we see a saved copy of the System Configuration page?
Mailing to you.
What's in your mail logs?
Absolutely nothing worthwhile :( Just a bunch of angry users with broken RT mail from a security patch. BTW, as an aside, these are completely conflicting pieces of information: Note that you should remove the '-t' from C<$SendmailArguments> if you use 'sendmail' rather than 'sendmailpipe' ... These arguments are good for sendmail brand sendmail 8 and newer C<Set($SendmailArguments,"-oi -t -ODeliveryMode=b -OErrorMode=m");>
