When MTA enabled, port 25 is open on all gateway interfaces by default

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Technical Level

Solution ID	sk110758
Technical Level
Product	Threat Emulation, Threat Extraction, Anti-Spam
Version	R77 (EOL), R77.10 (EOL), R77.20 (EOL), R77.30 (EOL), R80.10 (EOL)
Date Created	19-Apr-2016
Last Modified	05-Nov-2018

Symptoms

When MTA is enabled Port 25 is open on all gateway interfaces for connections destined to the gateway.

Cause

When MTA is enabled, it creates an Implied Rule which opens port 25 on all gateway interfaces for connections destined to the gateway by default.

Solution

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