Hi,
I couldn't provide better suggestion without your detailed transport rules. Please share it.
And do you mean you want to remove prepended message from subject line in any upon reply/forward messages?
For example: User@externaldomain.com sent to User@yourdomain.com with subject line:"From External", you create a transport rule to prepend subject line with message "[Test]", after this message is delivered, the subject line
is "[Test]From External". Then User@yourdomain.com reply this message, now you want to remove "[Test]" message from subject line, right?
In this case, it could be possible:
https://social.technet.microsoft.com/Forums/office/en-US/27f5be02-e7aa-4627-92f8-47d34669e1e8/prepending-word-external-to-subject-line-by-transport-rules?forum=exchangesvradmin
Best Regards,
Lynn-Li
TechNet Community Support
Please remember to
mark the replies as answers.
If you have feedback for TechNet Subscriber Support, contact
tnmff@microsoft.com.