====== Zimbra: Configuring maxmessagesize ======
<code bash>
# Switch to Zimbra user
su -u zimbra

# Check Postfix
postconf message_size_limit
message_size_limit = 10240000

# Set postfix
zmprov modifyConfig zimbraMtaMaxMessageSize 50000000
postfix reload

#Set IMAP globally
zmprov modifyConfig zimbraFileUploadMaxSize 50000000

# Set IMAP per domain
zmprov modifyServer mail2.domain.com zimbraFileUploadMaxSize 50000000
</code>
Restart Zimbra after executing this