I like how easy it was to set up our security rules for sending emails from different IP addresses with specific content filterings using regular expressions! We are also able solve various problems regarding incoming mail through this system such as blocked messages or spam filters which were not working at all before installing eGress iSMSM solution within few days of setting everything correctly by ourselves (which wasn't too much). It's very user friendly software so anyone can make use of its features without having technical knowledge about computers/networks etc..