SMTP mail

[David Ventimiglia]

Sending mail through SMTP fails for me, with the error "Sender verify
failed".  Has anyone seen this before with Emacs?  I'm trying to
figure out if I need to fix my Emacs configuration, or if the problem
lies outside of Emacs.

Here're my mail customizations:

(custom-set-variables
 '(message-send-mail-function (quote smtpmail-send-it))
 '(send-mail-function (quote smtpmail-send-it))
 '(smtpmail-auth-credentials (quote (("mail.msu.edu" 25 "ventimig" nil))))
 '(smtpmail-debug-info t)
 '(smtpmail-debug-verb t)
 '(smtpmail-smtp-server "mail.msu.edu")
 '(smtpmail-starttls-credentials (quote (("mail.msu.edu" 25 "" ""))))
 '(starttls-use-gnutls nil)
 '(user-mail-address "ventimig@msu.com"))

And here's the output from the SMTP trace buffer:

Process SMTP killed
220 sys15.mail.msu.edu ESMTP Exim 4.63 Fri, 07 Sep 2007 11:40:31 -0400
EHLO ventimig-2.user.msu.edu
250-sys15.mail.msu.edu Hello ventimig-2.user.msu.edu [35.10.222.24]
250-SIZE 52428800
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
STARTTLS
220 TLS go ahead
EHLO ventimig-2.user.msu.edu
250-sys15.mail.msu.edu Hello ventimig-2.user.msu.edu [35.10.222.24]
250-SIZE 52428800
250-PIPELINING
250-AUTH PLAIN LOGIN
250 HELP
AUTH PLAIN AHZlbnRpbWlnAFRtdGN0bXRzdHMx
235 Authentication succeeded
MAIL FROM:<ventimig@msu.com> SIZE=182
250 OK
RCPT TO:<ventimig@msu.edu>
550 Sender verify failed
QUIT
q221 sys15.mail.msu.edu closing connection

Of course, sending mail with SMTP using TLS works perfectly fine from
this computer when I use Thunderbird.

Cheers,
David