Secure SMTP Mail Protocol

Detection Information

The following page provides information on the Secure SMTP Mail Protocol.

Protocol Description

The Secure Simple Mail Transfer Protocol (SMTPS) is used for sending e-mail messages.

Full Name

Secure Simple Mail Transfer Protocol



Best Practices

Keep an eye on the size and number of SMTPS connections going through your network. If you see a spike in traffic, it could be spam or virus traffic from a malware infected system on your network.

Port Statistics

IP Protocol Flow Percent
TCP 587 90%
TCP 465 10%

Port Reference - RFC

  • TCP 465 - Message Submission Over TLS Protocol
  • TCP 587 - Message Submission



External Resources

Protocol Detection

Do you know how much Secure SMTP Mail traffic flows through your network? Netify's protocol detection engine and reporting provides insights to help manage your network.

What gets measured, gets managed.

Learn More

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