Zimbra Increasing Attachment Size works for 8.5

Through zimbraGUI didn’t find it how to do it, but through console it appeared to be working with the following set of commands to modify postfix actually-

su zimbra 
zmprov mcf zimbraMtaMaxMessageSize 20971520 
zmprov mcf zimbraFileUploadMaxSize 20971520 
zmprov mcf zimbraMailContentMaxSize 52428800 
zmprov modifyConfig zimbraMtaMaxMessageSize 52428800 
postfix reload

Once theyre executed, restart the server (restarting zimbra won’t reflect the changes made, so need a fresh reboot of OS)

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