On Tue, 30 Jul 2024 at 09:51, Phil Biggs via Postfix-users <postfix-users@postfix.org> wrote: > I only use list.dnswl.org (for good ones) and zen.spamhaus.org (bad) in > postscreen. Very effective but I did, just once, see an IP simultaneously > listed in both.
DNSWL is not for the good ones. It is for well-known mailservers. Useful for example to avoid greylisting them as you are certain they will retry later. So it is possible that a mailserver will be temporarily listed in a blacklist like ZEN if it also sends spam. BTW has there been any recent study on the effectiveness of greylisting? Is it still useful for some part of spam? Because I still see delayed incoming emails due to greylisting when the sender uses a bunch of different IPs for each delivery retry. -- bye, Marki _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
