Support - No-IP Support Center
Alternate-port SMTP FAQ 
- What about SPF with Alternate-port SMTP?
- I've activated alternate-port SMTP, what should my settings be?
- I'm getting the error, "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)" when trying to send on the alternate port 3325. What am I doing wrong?
- How do I configure my mail server to use Alternate-port SMTP with authentication?
- Does No-IP provide encrypted mail transfer (SSL)?
- Is there a limit to the number of recipients per email that I send?
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