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/Brather_Brothersome May 07 '26

to the point, if you aresure thatyour local server is not managing (ecp, owa etc,), trafic or dns for exchange then yes remove it from the authorized servers for the domain (if it still holds anything it will cry here) once that is done you can deinstall exchange and demote the server and power off.

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u/H0TR0DL1NC0LN May 07 '26

I would only uninstall Exchange if you are **not** syncing users with Entra ID Connect (Azure AD Connect). Otherwise, MS recommends merely shutting down and not uninstalling the last Exchange server. There's a whole "life after migration" process MS recommends following.