Originally Posted by nutwpinut

Also, even though ed10.net is a legit company, anybody can use it. An Eastern European hacker might be using im.a.hacker.bounce.ed10.net and some email servers will only look at the last 2 (ed10.net) or 3 (bounce.ed10.net) of the domain. They see the hacker and make bounce.ed10.net listed as a spam server and now emails from AA, aairlines.bounce.ed10.net, will be listed as spam when it is not. Email spam filters have gotten better so this shouldn't happen anymore, but I still see it occasionally.