Outgoing SMTP Blocking
We don’t hosting customers to use scripts that make outgoing SMTP mail connections directly to port 25 of mail servers outside our network.
Most shared hosting companies have the same policy. It prevents our servers from being added to anti-spam blacklists.
What happens if I try?
If you install a script that tries doing this with an IPv4 destination server, it will be redirected to our local mail server at the firewall.
If you try doing this with an IPv6 destination, the connection will be blocked at the firewall.
What’s the solution?
If you want to send outgoing SMTP mail from a script on your site, be sure to configure your script to use the outgoing mail settings shown on our “Generic E-Mail Settings” page (or even better, use sendmail). That will make sure your mail is sent without problems.