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Configure zimbra Maximum Message Size

The following explains how to Configure zimbra Maximum Message size. The default Zimbra MTA configuration uses the default Postfix message_size_limit of 10MB (10240000 bytes).You can confirm this by using following command.

#su – zimbra
$postconf | grep message_size_limit
message_size_limit = 10240000

Postfix configuration (zimbraMtaMaxMessageSize and message_size_limit)

$ zmprov modifyConfig zimbraMtaMaxMessageSize 30000000
$ postfix reload

File upload size configuration (zimbraFileUploadMaxSize)

$zmprov modifyConfig zimbraFileUploadMaxSize 30000000

The size of the zimbraMailContentMaxSize controls the overall message size

$zmprov modifyConfig zimbraMailContentMaxSize 104857600

Then this will allow 20mb uploads to the server mail2.domain.com:

$ zmprov modifyServer mail2.domain.com zimbraFileUploadMaxSize 20000000

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One thought on “Configure zimbra Maximum Message Size

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