Can't send mail through domain

by Support

We use a method of checking the identitiy of the mail sender called POPAuth on all our servers. Before outgoing mail will be accepted the sender must authenticate to the server - this prevents your domain from being exploited for unsolicited mail (spam) by 3rd parties. In general, you authenticate by checking a POP box on your domain, then a 'window of opportunity' opens during which time you can send mail from the same computer that just checked it.

Some reasons your mail may not going through:
1) Have you checked mail in the last few minutes? If not, check a POP account at your domain (even if you know there is no mail there) - this opens the 'window' again.
2) Make sure your outgoing (SMTP) server name is set to the same as the incoming - should just be 'domain.com' without the 'www' in front.
3) MS Outlook may require that you check a box labeled "My server requires authentication".
4) Some versions of Netscape mail (4.x and below) do not provide a method of authenticating before sending mail and therefore may not allow you to send mail out at all using your domain.
5) Some ISPs block all outgoing mail that uses a mail server other than theirs (blocking Port 25, AOL & Earthlink are a few). If your settings are correct but the error message says "relaying denied" this may be the case - check with your ISP.