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

Abbreviation

SMTPS

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.

Known Ports

  • TCP 465 - Secure SMTP mail port.
  • TCP 587 - SMTP mail message submission port.
  • TCP 25 - SMTP mail port.

Category

Mail

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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