On top of this, the IP ended up on the Spamhaus XBL, resulting in many many more systems rejecting mail from that nat. The IP has been removed from XBL so any ongoing issues with that are likely cache related.
Delisting is not enough as obviously some machine behind that IP is compromised/has malware. Until that is fixed, it's just going to keep getting relisted.
Is the filtering service broken?
in SpamCop Lounge
Posted
Delisting is not enough as obviously some machine behind that IP is compromised/has malware. Until that is fixed, it's just going to keep getting relisted.