Hi We have in our email server (standard qmail toaster last version). We sent a communication to all our users ref Spam policy and got a few "Delivery Status Notification Failure" with the following : Diagnosti-Code smtp;571 sorry, you are violating our security policies (#5.7.1 - chkuser)
The user for witch such message returned are active and random. Does anybody have any idea of what is going on? Helio Thanks
