Jonathan McDowell noodles@earth.li wrote:
I'm still confused as to how anyone's managed to pick up the blackcatnetworks address; AFAICT it doesn't appear in the headers anywhere, it's not used in the sender envelope and it's not publicised anywhere. I'm obviously wrong about one of these though, either that or Outlook is even more brain damaged that I can possibly comprehend.
Something is doing a double-lookup to resolve the name, perhaps. I doubt that, as I don't think lists had its own IP before. Other possibility is incorrect details in the subscription info. Can a recent subscriber confirm or deny that, please?
Can we block main@anyotherdomain at the MTA on that computer, please? My first suggestions would be to either use header filters or virtual-host alias files.
Thanks,
MJR