Forum Discussion
Transport Rule and Mail-enabled Security Group: Delayed Evaluation of Group Members
I have the following transport rule:
If the message:
Is sent to a member of group 'group-name@domain'
Take the following actions:
Redirect the message to 'shared-mailbox@domain'
and Stop processing more rulesWhen I add or remove members of the mail-enabled security group it takes a very long time until the transport rule seems to notice. Meaning, after adding members the messages are still NOT redirected and after removing member the messages ARE still redirected.
It takes about 4 hours until the change of the group becomes effective. After that the rule works perfectly fine.
Did anyone come across this too and is there any way to circumvent this?
Is this Exchange on-prem? I have seen responses to similar issues that say a restart of the MS Exchange Transport service will result in the new group membership being used immediately (I haven't experienced this or tested the resolution myself though).
Hi, this is a known behavior in Exchange. Transport rules cache group memberships for performance, so changes can take around 4 hours to update. Unfortunately, there isn’t a supported way to force an immediate refresh. One alternative is to consider using dynamic distribution groups if you need real-time updates.
