Configuring maxmessagesize

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The following provides instructions how to enable a Maximum Message Size for messages passing through the Zimbra MTA (ie. Postfix). The "maxmessagesize" config is unique to each Zimbra MTA you have (ie. if you have a distributed Zimbra deployment, you'll need to make change in each MTA host where you want this maxmessagesize limit enforced).

Postfix configuration

The following commands will set the message_size_limit to 2MB, you can adjust this value to your needs:

  su - zimbra
  postconf -e message_size_limit=''  ; this will clear the current value
 zmprov mcf zimbraMtaMaxMessageSize 20000
wait two minutes for the changes to be published then confirm the changes with this command
 postconf | grep message_size_limit
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