"Michael Orlitzky" <m...@gentoo.org>, 06.04.2020, 19:35: > On 4/6/20 1:32 PM, J. Roeleveld wrote: >> >> The messages were missing due to the MX being unavailable for a short >> period. Retries were not attempted as I would have received them. >> >> The spam filter is configured with certain mailing lists whitelisted. >>
> Here is proof that the Gentoo list server retries after ~8 minutes: > Mar 12 15:15:42 mx1 postfix/postscreen[27586]: NOQUEUE: reject: RCPT > from [208.92.234.80]:47590: 450 4.3.2 Service currently unavailable; > from=<gentoo-announce+bounces-2524-michael=orlitzky....@lists.gentoo.org>, > to=<mich...@orlitzky.com>, proto=ESMTP, helo=<lists.gentoo.org> > Mar 12 15:23:07 mx1 policyd-spf[20627]: prepend Received-SPF: Pass > (mailfrom) identity=mailfrom; client-ip=208.92.234.80; > helo=lists.gentoo.org; envelope-from > =gentoo-announce+bounces-2524-michael=orlitzky....@lists.gentoo.org; > receiver=<UNKNOWN> > I'm not saying you're lying about what happened, but that the conclusion > you're drawing from it is premature. The Gentoo list server (and every > other real MTA) retries deliveries. If you lost a message, I'd bet > that's not the reason why. And here's an example for J. Roeleveld's observed missed original messages: A few days ago I sent a message to this list. As usual, I received a bunch of DMARC reports from mailservers rejecting the messages. > From: "Seznam.cz" <forensicdm...@seznam.cz> > This is a spf/dkim authentication-failure report for an email message received > from IP 208.92.234.80 on Sun, 05 Apr 2020 22:14:23 +0200. > > The message below did not meet the sending domain's dmarc policy. The headers of that rejected message start with > Received: from lists.gentoo.org (unknown [208.92.234.80]) > by email-smtpd3.ng.seznam.cz (Seznam SMTPD 1.3.108) with ESMTP; > Sun, 05 Apr 2020 22:14:22 +0200 (CEST) This means that folks @seznam.cz (among others) will not get to see this message unless somebody replies to it from a domain that uses a less restrictive combination of SPF, DKIM and DMARC rules. So one possible cause for receiving replies to messages you didn't receive is the right mixture of configuration of sending domain and transmitting mail server. s.
