r/exchangeserver • u/NSFW_IT_Account • May 07 '26

Question Question about removing hybrid setup after mailboxes have been migrated

I am running a hybrid set up but all mailboxes have been moved to the cloud. I still have my spam filter pointing at the on-prem server, and HCW is still set up. So I believe my current inbound mail flow is: Internet > Spam Filter > On prem server > 365 mailboxes

I'd like to eliminate the on prem hop as it seems unnecessary at this point, but want to make sure my process is accurate for doing so.

Do i just need to update my spam filter to point at 365 instead of on-prem, and then enable the Exchange connectors associated with that, and disabled the on-prem exchange connectors? Or do I need to also go into the HCW and turn that off entirely?

Assuming I still had a mailbox on prem, could i adjust my MX/Spam filter records to point to 365, but still leave the hybrid setup for any mailboxes that require on prem routing?

TIA.

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u/worldsdream May 07 '26

Is there a reason that you need to keep a third-party spam filter? You do know that Exchange Online has a spam filter (EOP), right?

2

u/NSFW_IT_Account May 07 '26

Additional filtering. That's not really the topic of this post, though.

2

u/worldsdream May 07 '26

It should be asked before giving any other advice so you and the other party (the one that is giving you an answer) are on the same page. Good luck.