I am the admin for an 80 user Imail email server(version 8.14) and am currently trying to decide which anti-spam measures to implement. One of my options is to turn on a setting called, "Verify MAIL FROM address". What I fear is that this will result in a large # of legitimate emails being rejected?
I also have the options of "Perform reverse DNS lookup for connecting server" and "Verify HELO/EHLO domain?
Does anyone have any experience with these settings or any advice in general?