hawky--- via Postfix-users: > Hi Wietse, > > we are struggling with t-online.de: As you may know as SMTP client you > have to fulfill a bunch of requirements to be able to send mails to > t-online.de. From time to time we receive mails from t-online.de, but > can't answer. > > So our idea is, in case the mail comes from t-online.de, we process and > delivery the mail but return an (meaningful) error message to the > t-online.de SMTP client. > > This is meant as signal so that huge email provider can't dictate their > rules (besides SPF, DKIM, DMARC, etc. what we support) - and should > prevent a discussion like: "Just fulfill the requirements..." ;-)
If you want the business from t-online users, play by their rules instead of giving you users a poor experience when they respond to t-online email. Otherwise, you could reject t-online email selectively: smtpd_???_restrictions = .... reject_unauth_destination check_sender_access inline:{ {t-online.de = reject_unverified_sender}} ... If t-online.de blocks mail from your site, then the sender will receive some gibberish that they can pass on to their support people. Wietse > Thanks. > -- > Hawky > > > Am 20.09.2024 16:25 schrieb Wietse Venema via Postfix-users: > > hawky--- via Postfix-users: > >> Hi! > >> > >> I'm looking for a way to process and deliver an incoming email, but > >> return an error (with a meaningful) message to the client. > >> > >> By looking at the SMTP status codes > >> (https://en.wikipedia.org/wiki/List_of_SMTP_server_return_codes) I > >> don't > >> see an obvious way to do that. But maybe it is possible in a > >> non-obvious > >> way? > >> > >> Is it possible? > >> And if yes, can someone give me a hint howto implement? > > > > What problem are you trying to solve? Deliver-and-reject ALL email, > > or only SOME email? > > > > Wietse > > _______________________________________________ > > Postfix-users mailing list -- postfix-users@postfix.org > > To unsubscribe send an email to postfix-users-le...@postfix.org > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org > _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org