Recently my server was listed in some Blacklists. I've requested them to delist it. But there are many companies blocking us yet and I donīt know how to find their blacklist system. I've searched spamhaus.org, proofpoint.com, mxtoolbox.com, spamcop.net, and many others.
The messages I receive are the following:
Aug 25 10:37:50 webmail2 postfix/smtp: 19406C538876: host mix.company.com[IP ADRESS HERE] refused to talk to me: 554-hou150mix1.company.com 554 188.8.131.52 rejected based on reputation.
Aug 25 17:28:41 webmail2 postfix/smtp: E63AEC538830: to=<Email@email.com.>, relay=mail4.company.com.br[IP ADDRESS HERE]:25, delay=0.62, delays=0.03/0/0.58/0, dsn=4.0.0, status=deferred (host mail4.company.com.br[IP ADRESS HERE] refused to talk to me: 554 mail.company.com.br)
5.7.1 Recipient not authorized, your IP has been found on a block list (in
reply to RCPT TO command)
Does anyone knows how to discover these RBLs?