May 3, 2023 at 4:26 PM, "Matus UHLAR - fantomas via Postfix-users" <postfix-users@postfix.org> wrote:
> > > > > > > > > On 28/04/23 03:59, Sebastian Wiesinger via Postfix-users wrote: > > > > I'm not sure if I'm missing something but I can't find out why my > > > > body_checks doesn't catch all the backscatter I'm getting right now. > > > > > > > May 3, 2023 at 1:43 PM, "Peter via Postfix-users" > > <postfix-users@postfix.org> wrote: > > > > > > > > I've found that the best way to block backscatter is by using the > > > backscatter DNSRBL. Make sure you follow the instructions for setting it > > > up properly: > > > > > > https://www.backscatterer.org/?target=usage > > > > > > If used correctly it will only block DSNs from known backscatter sources. > > > > > > > On 03.05.23 05:51, Ken Peng via Postfix-users wrote: > > > > > But anybody can use our (even setup correctly) mailserver as backscatter > > source? > > > > can they? > > I think only if you accept mail and then bounce. > Well, all yahoo mail servers are working as this way (accept first then bounce). And I think there are others similar to this (forwarders, secondary MX etc). Regards. -- https://kenpeng.pages.dev/ _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
