Redirect only external message for 800 users

Question

Here is the scenario that I couldn't find answer to:

What we have:
We (company A) have sold part of the company (800 users) to company B. We need to redirect their email (Domain A) to their new email address Domain B with a twist

What we need:
ONLY Emails from outside the organisation should be redirected. Emails from domain A should be blocked/reject or deleted...
meaning employee1@domainA sends email to migrateduser@DomainA should be rejected/deleted
But employee1@Stuff .com sends email to migrateduser@DomainA should get redirect to migrateduser@DomainB

What I did:
First, I put in place one Transport Rule -> to delete email from inside organisation going to the migrated users.
And for the redirect I used the command Set-Mailbox -DeliverToMailboxAndForward $true -ForwardingSMTPAddress $new-address

What's the issue
The issue is that both are applied. employee1@domainA gets an error when he send email from to migrateduser@DomainA but his email is ALSO redirected to migrateduser@DomainB

Help
Any thoughts on this urgent matter?

Thanks

Answer 1

Hi @RAOUF HARBEG

Could you please provide the configuration of your transport rule? Do you configure the rule like below?

And the migrated user will receive the NDR message as well?

If so, please use the action Delete the message without notifying anyone instead. And I have test this action without issue.

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Answer 2

Thanks for your answer.

We did configure it to delete instead of reject after some tries/// no luck. In the message trace it states (second line)"Reason: [{LED=550 5.2.1 Message deleted by the transport rules agent};{MSG=};{FQDN=};{IP=};{LRT=}]" BUT the email is forwared any way (first line)

Thanks