hi all, i posting question have faced issue last week, migration done exchange 2007 o365. there 1 distribution list in on prem & in o365 group (synced aadc). 1 migrated user send email dl before & after migration, strange thing that, before migration ok, after migration user got message as " delivery has failed these recipients or distribution lists: *** email address removed privacy *** this message has many recipients. microsoft exchange not try redeliver message you. please try resending fewer recipients, or provide following diagnostic text system administrator". *** email address removed privacy *** #550 5.5.3 resolver.adr.reciplimit; many recipients ## i have checked same message id in o365 message trace & found following... 8/16/2017 11:17:55 am receive message received by: db4pr05mb397 message received by: db4pr05mb397 8/16/2017 11:17:56 am expand dl the message sent distrib
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