Hi, How would I match/block access to mail sent from MTAs that have FQDNs that start with
mta-wk-* it's not a header, it's not content, it's not an IP ... but, it's clearly logged in my postfix logs postfix.log:Mar 24 13:00:42 mail2 postfix/int01/smtpd[20932]: connect from mta-wk-1.mk1.ratineer.com[82.196.0.148] postfix.log:Mar 24 13:00:43 mail2 postfix/int01/smtpd[20932]: NOQUEUE: client=mta-wk-1.mk1.ratineer.com[82.196.0.148] postfix.log:Mar 24 13:00:58 mail2 postfix/int01/smtpd[20932]: lost connection after RCPT from mta-wk-1.mk1.ratineer.com[82.196.0.148] postfix.log:Mar 24 13:00:58 mail2 postfix/int01/smtpd[20932]: disconnect from mta-wk-1.mk1.ratineer.com[82.196.0.148] ehlo=1 mail=1 rcpt=1 commands=3 My goal is to block ALL mail from this list of MTAs https://groups.google.com/d/msg/news.admin.net-abuse.email/_6DLJB8fF9k/ZGBwTTsFBQAJ DNSBLs get many of them, but they apparently change IP addresses, and sneak through on occasion. All seem to be hosted by/at SYNAPP.IO Thanks.