Use port 587 if you can, 465 if you can’t, and 25 if you must.
Port 587 is technically correct, the best kind of correct. However, many ESPs have adopted implicit TLS on port 465. While you can send email over port 25 and 2525, it's much more secure to have the messages encrypted. This makes port 587 the preferred option for sending, with port 465 as a close second.
Here's a quick overview:
- Port 587: This port is typically used for email submission by mail clients (e.g., Outlook, Thunderbird) to a mail server. It is part of the standards defined in the Simple Mail Transfer Protocol (SMTP) for email transmission. Port 587 usually requires authentication and encryption, providing a secure connection for sending emails. It is commonly used for the submission of outgoing mail.
- Port 465: This port was previously used for Secure SMTP (SMTPS). It has now been deprecated by the Internet Engineering Task Force (IETF), and its use is not recommended. However, some legacy email systems may still use Port 465 for SMTP with SSL/TLS encryption.
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