Tried anthony's perl sendmail script as
the mailer-app and I get the following error: Can't call method "mail" on an undefined value at
/usr/local/src/freeswitch/scripts/perl/sendmail line 36,
<STDIN> chunk 1.
Well, at least that's some feedback.
Line 36 appears to be this: $smtp->mail($from);
I suspect the From: field is not being sent to the mail script because it's not getting populated somewhere. You can try hard-coding the $from variable for an ad-hoc test but I would definitely try to figure out why the field is not being populated in the first place.