I've installed Exchange 2007 SP1 on our server here, and published it via ISA 2006. I also have a domain company123.com. However I could only get a dynamic IP from our ISP.
Thus I use Dyndns to keep track of my IP: company123.dyndns.org, this is set in the modem router.
MX record (CNAME): company123.dyndns.org
mail.company123.com (CNAME): company123.dyndns.org
Everything looks fine except that emails it sent SOMETIMES went to spam folder and sometimes didn't. This has been happening intermittently and has caused frustration since I don't know if someone will receive an email I sent or not.
I read some articles about the destination mail server will receive my email as if it comes from company123.dyndns.org host rather than company123.com .
Is there a way to address this problem ? Or anything else you can suggest apart from getting a fixed IP address.