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Configuring an Exchange Server to accept mail from an additional domain
I've been Googling without success, looking for a step-by-step guide to configuring an Exchange server to accept mail from an additional domain. i.e. I want mail to the old bob@example1.com address and the new bob@example2.net address--both of which I own--to go to the same address, and I want the reply-to address changed so that replies automatically go to the new bob@example2.net address. I've already got the DNS set up so that both mail.example1.com and mail.example2.net go to the same IP.
Should be pretty straight forward - just add the new domain in the recipient policy. This article has some details that'll get you pointed in the right direction.
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http://www.petri.co.il/configure_exchange_2000_2003_to_receive_email_for_other_domains.htm