> Wietse Venema via Postfix-users <postfix-users@postfix.org>: > > Jaroslaw Rafa via Postfix-users: >> Dnia 16.04.2023 o godz. 16:32:41 Gerald Galster via Postfix-users pisze: >>> >>> Mails classified as spam or external forwards seemingly take another route >>> via mout-xforward.web.de. These servers are SBL-listed by intention, most >>> likely because the spam probability is higher in this context. This >>> separation >>> helps mout.web.de to maintain a better reputation. >> >> While I can fully understand separation of outgoing servers for different >> classes of emails, who the hell intentionally puts their own outgoing >> servers on a blacklist??? > > If I recall correctly, it has nothing to do with logic, and everything > with (German) law. > > Once a provider's server accepts an email message, it is illegal > for the provider to delete that message. By forwarding SPAM they > would risk messing up their non-spam repoutation. So they forward > it only from a sacrificial server that has a bad reputation.
Common practice in Germany is: once your server accepts an email it is responsible for delivery. You cannot silently discard it. If delivery fails, locally or to remote destinations, you are required to inform the sender (bounce). Therefore most providers implement pre-queue scanning. That allows the server to reject an email while the smtp connection is still alive and bounces are avoided. I'm not affiliated with web.de but the only reason I can see is that they want to uphold a good reputation while still offering popular forwarding. Even a 99% spam filter rate would be problematic at scale. Best regards, Gerald _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
