I'm receiving a lot of 421 rejects with: Unexpected connection response from server: 421 mails from 74.254.46.133 refused: local dynamic IP address 74.254.46.133"
Does anybody recognize the text of the message? I'd like to confirm that there are no popular DUL lists showing 74.254.46.133 as dynamic, but the 421 message says very little. DNSReport says it's clean. I've tried to contact some postmaster accounts (using Yahoo.com, since I can't use my own mailer) but they appear to be RFC ignorant too. Unfortunately, it's not just one ISP in Germany and I'd like to understand if there's anything I can do on my side. The only thing that comes to mind is that my rDNS is delegated to my own name server. Maybe there's some sort of DNS software out in the wild that doesn't support delegation? I'm really at a loss. Dan
