SMTP Mail Protocol

Detection Information

The following page provides information on the SMTP Mail Protocol.

Protocol Description

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

Full Name

Simple Mail Transfer Protocol

Abbreviation

SMTP

Best Practices

Keep an eye on the size and number of SMTP 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 25 > 99%
TCP 587 < 1%

Port Reference - RFC

  • TCP 25 - Simple Mail Transfer

Category

Mail

External Resources


Protocol Detection

Do you know how much 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.

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