Exchange 2010 / 2007 Alternate-port SMTP
KB ID 0000089 Problem I’ve used the no-ip service for years, and untill recently the Exchange box I ran gave me no problems, well it still does not, but now my wife has her Email on it as well, and because of reverse DNS Lookups, she cannot Email her friends at Hotmail etc. Instructions at the site (at the time of writing) are for Exchange 2003, which as you aware is a different beast altogether, so to make it work…....