Use PHP mail() function Never fails. lol. If you still want to use SMTP check your settings in backOffice -> Preferences -> Email. Some times SMTP and POP (or IMAP) server have different addresses, check this out and add the right one. If use SSL or other encription, servers adress change too. Check on your server the Number of port to use, usually is 25, but in many cases is 26 or other. in SMTP user write the full e-mail address with @ and .com Save changes to configuration. Once page re-load Test your e-mail configuration sending a test e-mail at the bottom of this screen. Hope this help you.