>>>>> "Matus" == Matus UHLAR <- fantomas <uh...@fantomas.sk>> writes:
Matus> you can check hostnames by using pcre map in Matus> check_reverse_client_hostname_access. e.g. refuse regex Matus> /(\d+)[.-](\d+)[.-](\d+)[.-](\d+)./ REJECT "generic DNS refused" Matus> (trailing . should avoid matching IP Addresses) I tried it with the as smtpd_client_restrictions = .... usual stuff check_client_access pcre: /etc/postfix/check_reverse_client_hostname_access.pcre Unfortunately the regex matches legitimate senders as well. I had INFO instead of REJECT and that save the situation and the mails arrived. Have I placed the check in the wrong place or am I back to square one. 2021-11-11T19:10:01.014343+01:00 myserver postfix/smtpd[3837]: Anonymous TLS connection established from mx1.goodserver.org[172.31.12.175]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-256) server-digest SHA256 2021-11-11T19:10:01.062736+01:00 myserver postfix/smtpd[3837]: NOQUEUE: info: RCPT from mx1.goodserver.org[172.31.12.175]: "generic RDNS"; from=<SRS0=Dzai=P6=lists.goodserver.org=meetings-boun...@goodserver.org> to=<john....@example.com> proto=ESMTP helo=<mx1.goodserver.org>
