On 12 Dec 2014, at 07:24 , Isaac Grover <isaac.gro...@gmail.com> wrote: > We have users on a domain who are convinced they are losing emails due to our > spam filtering (postscreen, amavis, spamassassin). We have shown them logs of > legitimate spam being filtered with no false positives, but they want to be > exempt from all spam filtering.
Postscreen filtering doesn’t delete email, it rejects it. The sender would have an immediate notification that the mail was not delivered. Unless they can show such rejections for legitimate mail I would tell them they need to trust that I know what I am doing and that I am not willing to open up my mailserver to abuse. If that’s not good enough, I am sure there are some terrible mailhosts out there that will allow all mail to their domain. Or they can get a colo machine and run their own mailserver. At some point, it becomes an issue of respect, either they trust you to do your job, or they don’t. If they don’t trust you and respect you, you’re better off without them. > Is it possible to exempt their domain from postscreen filtering, so they > receive every single email addressed to anyone in their organization, spam or > not? I sure can’t think of a way since many of the post screen tests (well, all of them) will be before the destination domain is known, right? True story: A number of years ago I administered the network for an office building with a T1 that included domain and mail hosting as part of the lease for each office. One of the people in the building got a new web designer who insisted they *had* to move their hosting to somewhere else. No skin off my nose, I get paid by the building owner. Anyway, their email volume (well, spam volume) on their new host was so massive that we had to rate-limit their access to the T1 because simply checking their mail was impacting the other offices. Their new host not only did not spam check at all, but also dumped *@domain.tld into their “main” mailbox. Their mail volume had increased more than a thousandfold, iirc. Good times. And that was long before postscreen and reliable RBLs. -- No one heard the cry that came back from the dead skull, because there was no mouth to utter it and not even a mind to guide it, but it screamed out into the night: CLAY OF MY CLAY, THOU SHALT NOT KILL! THOU SHALT NOT DIE! --Feet of Clay
