Update:
I can't open or view my last forum post.
https://xoops.org/modules/newbb/viewtopic.php?topic_id=28490&forum=1
I can view other posts, but not mine...

Anyway, here are some messages from my mail server (mercury mail) when XOOPS tries to use it in SMTPAuth mode to send a contact email from the Contact form.
This email has a few lines and should be at least a few bytes.

Connection from 127.0.0.1, Mon Dec 13 21:07:49 2004
HELO www.scalr.com
AUTH LOGIN
QUIT
0 sec. elapsed, connection closed Mon Dec 13 21:07:49 2004

When I try to send a test message using Outlook, here're the messages on my mail server:

Connection from 192.168.0.1, Tue Dec 14 01:38:55 2004
EHLO fatboy
AUTH LOGIN
MAIL FROM: <sid@scalr.com>
RCPT TO: <sid@scalr.com>
RSET
RSET
MAIL FROM: <sid@scalr.com>
RCPT TO: <sid@scalr.com>
DATA - 11 lines, 367 bytes.
QUIT
3 sec. elapsed, connection closed Tue Dec 14 01:38:58 2004

Obviously, the mail server is working correctly, XOOPS is just not sending any data!

Is there something I can check in my XOOPS setup?

-sid

After upgrading to XOOPS 2.0.9 beta and now to 2.0.9.2, the mail problem has mysteriously disappeared.
It's troubling to not know what's going on, but I'm happy to have a working mail system.

- Sid
ScALR Network Solutions