First off I am not a DNS guru.
I was reading about SRV records as it relates to exchange.
What is the difference between a SRV record and a CNAME? It appears that a SRV record can direct a request to a mail server and port #. When you create the SRV record in Windows, is the SERVICE a drop down menu that allows you to select a predefined service or is it anything you wish to type in?
A CNAME can direct a request to a taget host which I can make it the mail server. However, I can't control the port. Would this be the main difference between the two?