Setting the message size limit

Overview

By default, the size limit for messages accepted by the Cryptshare Mail Gateway is approximately 10 MB (10,240,000 bytes). If an SMTP client, for example your mail server, tries to send larger messages to the Cryptshare Mail Gateway, it responds with error code 550 5.3.4. This page describes how to change this message size limit.

Configuration Steps

  1. Configure both Postfix instances with the new message size limit, in bytes. For example, to set a limit of 25 MB (25 * 1024 * 1024 = 26214400):

postconf -e "message_size_limit = 26214400"
postconf -c /etc/postfix-nta7516 -e "message_size_limit = 26214400"

  1. Reload the Postfix configuration:

postfix reload