Knowledgebase: SMTP
What port should I use for SMTP Service?
Posted by on 07 February 2013 08:27 PM

You can configure your email client or server to send all authenticated SMTP traffic to any of the following ports:

SSL or non-SSL: 21, 25, 5521, 5525, 7721, 7725
SSL only: 465, 5555

If you are encountering an issue with port 25, please try using a different port such as 5525 as your ISP may be blocking outgoing port 25. If a problem is still present, please submit a support ticket for assistance.

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