On Tue, Jul 14, 2009 at 06:37:30AM -0400, Wietse Venema wrote: > Keld Jørn Simonsen: > > On Mon, Jul 13, 2009 at 06:58:28PM -0400, Wietse Venema wrote: > > > Keld J?rn Simonsen: > > > > Is there a way to disambiguate between DNS timeouts and DNS errors, > > > > and discard the latter? > > > > > > Postfix is only the messenger of the bad news. When the server > > > responds, Postfix acts accordingly. When the server does not > > > reply, Postfix assumes that this is a temporary error, because > > > assuming otherwise would cause a lot of mail to fail. > > > > Yes, but there are two types of bad news: one is that we do not know if > > everything is fine, timeout, and the other that we positively know > > something is wrong. I understand that in both cases postfix gives a 450 > > code, and that there is no way in postfix to change this code. Is that so? > > Some people are thick enough that they need everything spelled out.
Oh, you mean me? No, I am bright, so that can't be:-) But I see that you did say that it reacts differnetly on timeouts and error codes. Still there is something that I do not understand, and which gives me problems, see below. > OK, here goes: > > 1) The server replies with "good news". Postfix replies with good news. > > 2) The server replies with "bad news". Postfix replies with 5xx. > > 3) No server reply. Postfix replies with 4xx. > > Is this finally clear? Yes, thanks. But it seems that my postfix reacts differently on a NXDOMAIN and SVRFAIL, although they both should lead to 5xx error codes. That is why I am so thick to not understand. >From my previous post: Jul 14 00:11:58 rap postfix/smtpd[1054]: NOQUEUE: reject: RCPT from rap.rap.dk[127.0.0.1]: 450 4.1.8 <jets...@server30.reverya.com>: Sender address +rejected: Domain not found; from=<jets...@server30.reverya.com> to=<k...@localhost> proto=ESMTP helo=<rap.rap.dk> Jul 14 00:11:58 rap postfix/smtpd[1054]: +> rap.rap.dk[127.0.0.1]: 450 4.1.8 <jets...@server30.reverya.com>: Sender address rejected: Domain not found here there is a 450 response to a name server error. You said above: > 2) The server replies with "bad news". Postfix replies with 5xx. 5xx is not 450, so what is happening? And thanks for you patience with me. Best regards keld
