Ralph Angenendt ra+centos@br-online.de writes:
I really don't understand why people just don't turn off their mailservers if they don't want mail from others.
Most of us have come close. I get north of 500 spams a day unprotected. I've been using the same email since '01. I know many others have it worse than I do.
At that point, there is no choice about loosing mail. When sorting that by hand (and I have) I delete a significant amount of good mail. The automated filters usually do much better than this human when you have 10 spams for every legitimate mail.
Rejecting mail from mailservers that don't follow the generally accepted best practices, I think, is completely reasonable. It gets rid of a whole lot of spam, and the rules are pretty simple and easy to follow, so I think it is completely reasonable to ask people who run mailservers to put in a little effort to setup things like rdns, and to make sure they don't do things like retry once a minute.
what if my mailserver was rejecting with a 4xx because it was overloaded? retrying every minute would certainly not help things.