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What is the difference between ports 465 and 587?


What is the difference between ports 465 and 587?

These ports 465 and 587 are both used for sending mail

Port(s) Protocol Service Details Source
587 tcp smtp Outgoing SMTP Mail port (TLS/Start TLS Port)
Used by various outgoing mail servers as an alternative to port 25.
Yahoo SMTP server uses this port, Apple MobileMe Mail (SMTP authentication), Gmail.
See [RFC2476]
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Port(s) Protocol Service Details Source
465 tcp smtp-ssl Outgoing SMTP Mail over SSL (Gmail uses this port)

PlayStation Network and SCEA Game Servers use this port

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465 udp igmpv3lite Cisco IOS 15.2S allows remote attackers to cause a denial of service (interface queue wedge) via malformed UDP traffic on port 465, aka Bug ID CSCts48300.
References: [CVE-2011-4015]

IGMP over UDP for SSM (IANA official)

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465 tcp Cisco protocol (unofficial) Wikipedia
465 tcp SMTP over SSL (unofficial) Wikipedia
465 tcp urd URL Rendesvous Directory for SSM IANA
465 udp igmpv3lite IGMP over UDP for SSM IANA
465 tcp,udp smtps smtp protocol over TLS SSL (was ssmtp) ssmtp) SANS
465 tcp,udp smtps smtp protocol over TLS/SSL (was ssmtp) Nmap


Port 465
is for smtpsPorts 465 and 587 are intended for email client to email server communication – sending email.

SSL encryption is started automatically before any SMTP level communication.

Port 587 is for msa
It is almost like standard SMTP port. MSA should accept email after authentication (e.g. after SMTP AUTH). It helps to stop outgoing spam  to SMTP port (port 25).


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