Just to close out this thread: On Tue, Nov 26, 2013 at 2:54 PM, Wietse Venema <wie...@porcupine.org> wrote: > Lucas Bergman: > > Nov 25 14:06:23 gob postfix/smtpd[19293]: NOQUEUE: reject: RCPT from > > unknown[12.229.68.221]: 450 4.1.8 <circ...@lcplin.org>: Sender address > > rejected: Domain not found; from=<circ...@lcplin.org> to=<[REDACTED]@ > > BERGMANS.US> proto=ESMTP helo=<sangria.lcplin.org> > > 450 Means that Postfix did not receive a DNS reply. There could > have been a network outage, or your link was saturated, or whatever.
I was skeptical, because I saw many rejections of the same type while service on the host was otherwise fine. I looked in my BIND logs, and found that lcplin.org lookups in particular were failing for about a day with some inscrutable (to me) DNSSEC issue. They eventually got themselves sorted, and messages are good again. In my defense, their getting their zone sorted was contemporaneous with me changing Postfix settings. Thanks for the education, and sorry about the noise. -- Lucas
