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Marc-8505 asked Marc-8505 commented

EOP chooses the default connector and not the one created.

I have created an outboubd connector but the EOP chooses the default connector created by AD Azure connect and not the one created.
If I disable the default one all works well.
I couldn't figurate why.

office-exchange-online-itprooffice-exchange-server-mailflow
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Connectors arent created by Azure Connect. Did you run the hybrid wizard? thats the one typically created.
Why did you create a new connector and not use the one created for you?
What the settings and how are they different from each other?

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AndyDavid avatar image
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AndyDavid answered

Those probably conflict since they probably have essentially the same domains.
Any reason you cant disable the one you dont want to use?

You could also use a transport rule in Exchange Online
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/conditional-mail-routing

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Marc-8505 answered Marc-8505 edited

two connectors were created when all users were synchronized with M365 (to use some service like Teams). The mailboxes are still on-prem.

It is not possible to validate this outbound connector so I couldn't edit it.

The difference are:
Dafault= only when email message are sent to this domain ( asterisk value)+ TLS
Created= for email messages sent to all accepted domain....+ NO TLS

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Marc-8505 answered Marc-8505 edited

With a specific rule that redirect to a specific connector it works.
Honestly I was very curious to understand why the EOP had this behavior.
It seems to me from the tests done either the default connectors disable the others once (Microsoft internal rule) or the connector that uses TLS has the priority to the others without it. Not sure

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Marc-8505 answered Marc-8505 commented

Hi Andy,

using this rule that redirect emails to a specific connector, are we going to exclude the EOP antispam?

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Any SPAM EOP sees will still be handled per your anti-spam policy.

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Thank you

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