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.