Upon new user registration (with first password sent by email option enabled) the resulting screen has the following message at the top:
(the password email never makes it to the new registrant)
code:
Warning: Mail delivery program returned with exit code: 17152 in /usr/local/etc/httpd/ubbthreads/adduser.php on line 308
Warning: Mail delivery program returned: Undefined error: 0 in /usr/local/etc/httpd/ubbthreads/adduser.php on line 308
Note: This is on a *nix box. The mailer works fine, it sends out admin notices of new registrations approvals and so forth.
Rob