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What SMTP port should I use?

SMTP communication between mail servers uses TCP port 25. Mail clients on the other hand, often submit the outgoing emails to a mail server on port 587 or 465. The latter port was previously deprecated, but this changed with RFC 8314 and its use is now recommended to ensure security.

What internet service uses the SMTP protocol?

Short for Simple Mail Transfer Protocol, SMTP is an Internet standard for the sending of e-mail messages over port 25. While it is mostly used for transfer from one mail server to another, some client mail applications use SMTP for relaying messages; whereas receiving happens via POP or IMAP.


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