Changing the to: email address of an email arriving in a mailbox.

Question

Hi, we would like to do the following

1. Have a mailbox (alias?, forwarded?) with 2 emails addresses a@xyz .com and b@xyz .com
2. Receive emails via both addresses
3. See all emails in the mailbox as being sent to a@xyx .com regardless of where they were sent to. i.e. basically change b@xyz .com to a@xyz .com

Can this be done in Exchange server? if yes, how?
We need all emails to show that they came to a@xyz .com because the emails are read into Dynamics CRM via the e-mailrouter, which will only process the emails sent to a@xyz .com

Thanks
Christian

Answer 1

If a@xyz .com is his primary email address, just add other addresses in EAC-recipients-mailboxes-email address and all messages sent to b@xyz .com will show the recipients as a@xyz .com
If you need changing the primary email address, this command should help:
Set-Mailbox domain\username -PrimarySmtpAddress user@keyman .com -EmailAddressPolicyEnabled $false

Answer 2

If to a@xyz .com is the primary SMTP address, that is expected. Exchange will always resolve the recipient address to the Default/Primary Address.

You will need to have Dynamics check the header for the original SMTP address of the recipient or use two mailboxes and set the second mailbox set to b@xyz .com as the primary and have Dynamics use that mailbox as well.

Answer 3

Many thanks for both of you to answer my question.

I forwarded your answer to our Exchange guy and he was able to set up b@xyz .com as described in EricYin answer. This works as described.

Thanks again
Christian