Steps to increase max message size for ActiveSync devices

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Problem:

ActiveSync devices downloads only 7MB starting part of a message.
OR
Outlook with EAS configuration downloads only starting 7MB part of large messages.

Solution:

Bydefault ActiveSync device are allowed to download 10MB size messages.
There is a separate attribute "zimbraMobileMaxMessageSize" available to control max message size for ActiveSync devices.

With the help of following commands we can change/increase default limit.

su - zimbra
zmprov mcf zimbraMobileMaxMessageSize "31457280"            #Example to set limit to 30mb. 
zmmailboxdctl restart  

Submitted by: Heera Singh Koranga