Hi,
On Mar/06/2022, Wietse Venema wrote: > Carles Pina i Estany: > > > You can't use reject_unknown_client_hostname for that > > > site, if you want to receive their email. > > > > I think that it might be possible to white list a client? > > Described in: > > https://serverfault.com/questions/202978/can-i-make-an-exception-to-reject-unknown-client-hostname > > > > I haven't tried it. > > You could also try to run Postfix without reject_unknown_client_hostname. I did for a different instance and yes, Postfix accepted the email. I see lots of spam email rejected thanks to this. Now that I'm here, I would like to add: I think that what confused me is that Postfix said: NOQUEUE: reject: RCPT from unknown[188.39.73.166]: 450 4.7.25 Client host rejected: cannot find your hostname, [188.39.73.166]; from=<something> to=<user@domain>... Because it says "from UNKNOWN" (capitals are mine) I thought that Postfix couldn't find the hostname ("IP address->name mapping fails" case). I didn't think of a mismatch ("name->address mapping not matching the client IP address") (Unknown it implied to me a problem with the DNS resolving... and a 4XX I read that is a softfail not a hard fail) Obviously it's well written in the docs :-) I should have read them! Cheers, -- Carles Pina i Estany https://carles.pina.cat
