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4 changes: 2 additions & 2 deletions docs/email/running-a-mail-server/index.md
Original file line number Diff line number Diff line change
Expand Up @@ -245,8 +245,8 @@ Here are some of the typical mail ports:
* `143`: IMAP
* `993`: IMAPS (encrypted)
* `25`: SMTP (sometimes blocked by ISPs)
* `587`: SMTP (actually the preferred non-encrypted port for outgoing connections from mail clients)
* `465`: SSMTP (encrypted)
* `587`: SMTP (The preferred non-encrypted port for outgoing connections from mail clients. Use STARTTLS for encryption.)
* `465`: SMTP (should only be used for legacy support)

If you're using a firewall, be sure to edit the rules for your mail server's ports. See Linode's guide to [configuring a firewall](/docs/security/securing-your-server/#configure-a-firewall) for more information.

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