Email activated folders Mailflow during online migration in a complete hybrid scenario

%3CLINGO-SUB%20id%3D%22lingo-sub-1718698%22%20slang%3D%22de-DE%22%3EEmail%20activated%20folders%20Mailflow%20during%20online%20migration%20in%20a%20complete%20hybrid%20scenario%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1718698%22%20slang%3D%22de-DE%22%3E%3CP%3EHow%20does%20the%20mail%20flow%20work%20after%20we%20have%20migrated%20the%20public%20folders%20content%20to%20Exchange%20Online%3F%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EEnvironment%3A%20%3CBR%20%2F%3E%20-Exchange%202010%20public%20folders%20(partially%20email%20enabled)%20%3CBR%20%2F%3E%20-Exchange%202016%20for%20administration%20%3CBR%20%2F%3E%20-%20complete%20hybrid%20configuration%20with%20AADC%20and%20HCW%20-%20%3CBR%20%2F%3E%20centralized%20mail%20flow%20via%20onpremise%20spam%20filter%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAfter%20we%20successfully%20moved%20all%20content%20to%20the%20cloud%20and%20the%20access%20from%20the%20clients%20was%20also%20successful%2C%20we%20were%20not%20able%20to%20send%20emails%20to%20the%20email%20enabled%20public%20folders.%20The%20Exchange%20Server%20thought%20it%20should%20be%20delivered%20internally.%20At%20some%20point%20there%20was%20just%20an%20NDR!%3C%2FP%3E%3CP%3EDid%20we%20forget%20to%20do%20something%20else%3F%20Do%20we%20have%20to%20manipulate%20or%20delete%20the%20MESO%20objects%20or%20create%20contacts%20(500)%3F%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1718698%22%20slang%3D%22de-DE%22%3E%3CLINGO-LABEL%3E2010%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3E2016%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EExchange%20Online%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EExchange%20Server%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EHybrid%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EOffice%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
Senior Member

How does the mail flow work after we have migrated the public folders content to Exchange Online?

 

Environment:
-Exchange 2010 public folders (partially email enabled)
-Exchange 2016 for administration
- complete hybrid configuration with AADC and HCW
- centralized mail flow via onpremise spam filter

 

After we successfully moved all content to the cloud and the access from the clients was also successful, we were not able to send emails to the email enabled public folders. The Exchange Server thought it should be delivered internally. At some point there was just an NDR!

Did we forget to do something else? Do we have to manipulate or delete the MESO objects or create contacts (500)?

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