[IMail Forum] message delivery failure

[Nitesh \(Ipswitch Mailing List Member\)]

Hello,           When I send an email to certain addresses, the emails bounce back with the following reason   Delivery failed 10 attempts: ########## Server response to MAIL FROM: 450 4.1.8 invalid/host-not-in-DNS return address not allowed   I have checked all the settings of the Imail server and there is no problem at all. The funny thing is that the emails sent to the same addresses from any account of the official hostname get delivered. I am running multiple domains in the server.   Does anybody have the idea of such an erratic behavior?