You need an internal and an external MX record. You have one externally: imcu.com MX preference = 5, mail exchanger = MX1.imcu.com
obviously, I cannot check internally for you. From: [email protected] [mailto:[email protected]] On Behalf Of David McSpadden Sent: Tuesday, October 21, 2014 10:21 AM To: [email protected] Subject: [Exchange] SplitDNS and Certs Ok I have reviewed the emails from last week. Looked into my org's dns records. I have a forward lookup zone of imcu.com with a mail 'a' record. The way the article by jon-alfred smith reads I should have a zone mail.imcu.com?? Doesn't appear to be correct but I am not 100% sure.
