Steps to increase max message size for ActiveSync devices

Increase max message size for ActiveSync devices (Legacy activesync)

   KB 23358        Last updated on 2021-11-3  

(0 votes)


ActiveSync devices or Outlook EAS downloads only the first 7 MB of a message.


By default ActiveSync devices are allowed to download only 10 MB size messages. There is a separate attribute "zimbraMobileMaxMessageSize" available to control this maximum size.

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

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

Submitted by: Heera Singh Koranga
Verified Against: ZCS 8.7 Date Created: 2020-04-13
Article ID: Date Modified: 2021-11-03

Try Zimbra

Try Zimbra Collaboration with a 60-day free trial.
Get it now »

Want to get involved?

You can contribute in the Community, Wiki, Code, or development of Zimlets.
Find out more. »

Looking for a Video?

Visit our YouTube channel to get the latest webinars, technology news, product overviews, and so much more.
Go to the YouTube channel »

Jump to: navigation, search