Forum Discussion
Exchange Hybrid - On-Prem mailboxes can't send to Online mailboxes
We're now running Exchange Hybrid OnPrem: Exchange 2019 latest patch. On-Prem mailboxes are not able to communicate with mailboxes in Exchange Online in any way. The other way around is working ...
Sorry for the inconveniences or delays this issues may have caused you. To start troubleshooting, can we get more information about the issue?
1. When it started?
2. Did you just start sending to Exchange Online from this IP?
Exchange Online will grey list and back off connections it hasn't seen before in some cases. Especially if they are "spammy" in nature. Usually, after that initial back off period or when a contact is placed to Microsoft, EOP will allow these and they will go through.
If this is something that just started occurring, then you can removing and re-adding the send/receive connector.
Thank you!
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We only just ran the HCW a day ago, to move to Hyrbrid. So in that sense, yes it just started and we just started sending data to Exchange Online.
You suggest manually removing the send connector in Exchange on-prem and the receive connector on Exchange Online and then re-add them?
Would just disabling/enabling do the trick as well?
Oh and mailboxes can successfully be migrated from on-prem to Exchange Online. So that works too right now as well.
Thank you for your prompt response. I am glad I was able to provide a fix to the issue you are having. You can reach out to me if you need further clarification or assistance.
Kindly mark your post as solved and please give it a like too.
If I have answered your question, please mark your post as Solved
If you like my response, please give it a Like
Appreciate your Kudos! Proud to contribute! 🙂
- Hi RecepGencaslen,
the issua is not resolved. Not sure where in my previous post I implied that it was resolved. The fact that the mailboxes can be migrated, was provided as additional information that may be valuable to find a resolution.
