I have a domain name called xxx-yy.com pointed to my external firewall IP. My internal domain is named xxxyy.com. I have been tasked with the job of implementing Exchange 2003 internally. (We have been using a hosted solution until now.)
I have installed and configured Exchange 2003 in domain xxxyy.com. This results in the users primary SMTP address as email@example.com.
I have changed the MX records for domain name xxx-yy.com to point to my external firewall IP.
I have opened SMTP 25 and redirected traffic to my internal Exchange servers IP. (Tested successfully via telnet using mail.xxx-yy.com and firstname.lastname@example.org)
I have added a second smtp address to each user account so they all have both email@example.com and firstname.lastname@example.org addresses.
However, no mail is being delivered to the users accounts. Any guidance would be greatly appreciated.