In this article you will find a short how-to on how to fix the issue that some Samsung phones can receive mail, see calendars, but cannot send mail via Zimbra. Users will see messages go immediately to the outbox with a warning that the message was not sent.
ActiveSync protocol version
This issue affects only some Samsung devices that use the Samsung Email app. To fix this issue you can set the zimbraMobileForceSamsungProtocol25 to TRUE and users will need to reconfigure their account on the mobile mobile device.
The zimbraMobileForceSamsungProtocol25 setting can be done on a per account or Class of Service level. Via the command line you can set this as follows:
su - zimbra # For the default Class of Service zmprov mc default zimbraMobileForceSamsungProtocol25 TRUE # For one account zmprov ma user@example.com zimbraMobileForceSamsungProtocol25 TRUE
You may want to set this setting for all Classes of Service as follows:
for i in $(zmprov gac); do zmprov mc $i zimbraMobileForceSamsungProtocol25 TRUE; done
The setting of zimbraMobileForceSamsungProtocol25 is currently not supported via the Admin Console web-UI.
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