This is driving me nuts… Linux Debian + postfix… /etc/postfix/main.cf has the following lines:
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/access, reject_invalid_hostname, reject_non_fqdn_recipient, reject_non_fqdn_sender, reject_unauth_destination, reject_unauth_pipelining, reject_unknown_recipient_domain, reject_rbl_client cbl.abuseat.org, reject_rbl_client sbl-xbl.spamhaus.org, check_policy_service unix:private/policyd-spf, check_policy_service inet:127.0.0.1:10023, permit_auth_destination, reject
These days postfix is rejecting incoming messages from one single IP:
email@example.com SMTP error from remote mail server after RCPT TO:<firstname.lastname@example.org>: host mail.server.ext [18.104.22.168]: 554 5.7.1 Service unavailable; Client host [22.214.171.124] blocked using cbl.abuseat.org; Blocked - see http://cbl.abuseat.org/lookup.cgi?ip=126.96.36.199
Well… http://cbl.abuseat.org/lookup.cgi?ip=188.8.131.52 reports no blacklisting of 184.108.40.206 (obviously the IP 220.127.116.11 is not the real one).
Dozen emails have been blocked so far for the same reason, but each time I manually query the RBL, the IP is reported as clean.
Is postfix caching queries to RBLs? What am I missing?
Thanks in advance for your time.