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
$postconf | grep message_size_limit
message_size_limit = 10240000
Postfix configuration (zimbraMtaMaxMessageSize and message_size_limit)
$ zmprov modifyConfig zimbraMtaMaxMessageSize 30000000
$ postfix reload
$ 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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