Too many undeliverable mails in the postfix queue

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Technical Level

Solution ID	sk114034
Technical Level
Product	Threat Emulation, Threat Extraction
Version	R77.30 (EOL), R80.10 (EOL)
OS	Gaia
Platform / Model	All
Date Created	30-Oct-2016
Last Modified	09-Jan-2020

Symptoms

The command "/opt/postfix/usr/sbin/postqueue -c /opt/postfix/etc/postfix/ -p" shows too many mails which are not deliverable stuck in the postfix queue.

Cause

This happen if the Postfix cannot deliver mail to the relay server, and also cannot send the undeliverable report to the original sender.

In case there is no recipient verification process for incoming mails in the front of the MTA. The Postfix does not know if the recipient exist or not. (It is not recommended to act as first contact for incoming mails.)

The Check Point Mail Transfer Agent (MTA) accept all mails without any restriction.

Solution

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