SMTP

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wikipedia:SMTP

• TCP Port 25
• TCP Port 587, is the default mail submission port. When an email client or outgoing server is submitting an email to be routed by a proper mail server, it should always use SMTP port 587 as the default port.

Related terms

• STARTTLS (RFC 2487 in 1999)
• SMTPS

See also

• Mail, SMTP, submission, SMTPS, POP, IMAP, StartTLS, Exim, Postfix, IRedMail, Fail2ban, Dovecot, Roundcube, DKIM, SPF, DMARC, MX, ssmtp, mailx
• Mail, email: Postfix, mail, SMTP, LMTP, POP3, IMAP, mailutils, amavis, Gmail, iCloud, ssmtp, msmtp