SMTP Ports

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Some ISP's block SMTP relaying as a security precaution. This means that you can either use their SMTP server or try a different port.

The normal SMTP port on servers is 25. This is also the port that many ISP's block. On my servers there are 3 available ports for SMTP:

Available SMTP ports

  • 25 (Old standard)
  • 587 (Fairly recent new standard, see RFC 2476)
  • 5190 (Alternate port)


Google Apps

If the standard port (465) is not working, try using 587. You can also try using their alternate mail server "smtp.googlemail.com".

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