This can happen because SPFBL has 3 different response codes for their blacklist: 127.0.0.2 – which means that your IP is blacklisted for confirmed spam 127.0.0.3 – which means that your IP is only suspected of sending spam, or it’s misconfigured (not in compliance with RFC 5321) 127.0.0.4 – which means that your IP isn’t […]
