Yes, dude, I feel you. I was there. I got the same shit. A few more examples of their wonderful software: - GMail sometimes accepted mail from IPv4 but not IPv6. - I rebuilt the VM running postfix, got a new IP address and then mail was blocked due to "IP address is known as dynamic end-user"

Worst of all, the mail does not always bounce... and when it does, this is no one to email and ask. What are mail admins supposed to do?