Support - No-IP Support Center

Alternate-port SMTP FAQ
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Does No-IP provide encrypted mail transfer (SSL)?

Yes, No-IP offers all industry standard email submission encryptions.
Here is the breakdown:

Outlook and Outlook Express
(implicit SSL clients)

Use port 465 and check the Use SSL Encryption check box.

All other modern email clients, STARTTLS enabled
(explicit SSL clients, e.g. Thunderbird, Mail.app, Evolution)

Use port 3325 or port 587 and check the Use SSL Encryption check box.

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