Email flows from Office 365 to on prem and back to Office 365

Dear EE

I recently changed my domain’s MX to point to EOP. Mail flow is working to my 365 and on prem mailboxes fine however when emailing a 365 mailbox ,the email goes to EOP then on prem which routes it back to EOP. In 365 I set my accepted domains to authoritative however the result is the same so I set them back to internal relay. Please help. In my on premise org those domains are set to authoritative.

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TTAF4Asked:
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Vasil Michev (MVP)Commented:
How long did you wait after setting the domain to authoritative? Do you have Centralized mail transport enabled? Does this happen for all users or only some?
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TTAF4Author Commented:
I waited  for a few minutes. Paul from practical365.com also seems to think that I have centralized mail transport enabled. How do I go about checking that? I wasn't the one that ran the HCW initially. I have several vanity domains. One of them is called ttafeop.co.za. This was a test domain that I created. The MX for this domain also points to EOP. This domain is currently set to authoritative but even when it was set to internal relay email flowed perfectly.

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Vasil Michev (MVP)Commented:
Simply rerun the HCW, it will show you whether it's enabled and you can quickly disable it.
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TTAF4Author Commented:
Will re-running the HCW cause an interruption in mail flow? Sorry for the many questions.
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Vasil Michev (MVP)Commented:
Only if you change things :)
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TTAF4Author Commented:
turns out Centralized mail transport  was enabled.
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