Hi,
Which version of CMS Builder are you using? If it's 2.17 or 2.50 I would enable mail loggin under general settings, and then check the outgoing mail section to see if CMS Builder is trying to send mail. If it is, it's most likely a server issue.
Has this suddenly started happening? Or have you changed anything recently, eg upgraded CMS Builder or upgraded a plugin.
One of the first things I would check is the $emailHeaders array on your user password request page. You could use the showme function to output its content:
showme($emailHeaders);
This will allow you to check that everything looks correct , e.g, no missing e-mail addresses or incorrect file paths.
Thanks!
Greg
Greg Thomas
PHP Programmer - interactivetools.com