Years ago when part of my job was babysitting a commercial subscription stock market research distribution list, we had to create separate queues for major email providers, etc (gmail, Hotmail, yahoo) so that any one of them wouldn't delay others. We ended up with about two dozen separate queues, but it solved 95% of our issues. The only major issue we ran into was one research report ended up being discarded by every single email system. Turns out it was a deep dive on pharmaceutical manufactures of ED makers. We ended up having to mass fax the report 😊 Matthew Huff | Director of Technical Operations | OTA Management LLC Office: 914-460-4039 mhuff@ox.com | www.ox.com ........................................................................................................................................... -----Original Message----- From: Outages <outages-bounces@outages.org> On Behalf Of Jürgen Botz via Outages Sent: Tuesday, October 5, 2021 5:34 AM To: Chris Lawrence via Outages <outages@outages.org> Subject: [outages] Meta: outages outage OK, aside from the Facebook outage, and no doubt because of it, we effectively had an outages outage... messages to the lsit were massively delayed, causing lots of duplicate reports and general failure to have any meaningful confirmations, etc. Why? What happened? Well, outages is hosted on a server (puck.nether.net) with a couple dozen other lists, and some of these lists probably have members with email addresses at facebook domains, and the SMTP server kept trying to look those up and having wait for timeouts? Something like that, except that since there were no routes to facebook's nameservers there shouldn't have been any need to wait for timeouts. Anyone here form nether.net actually take a look? It's more than idle curiosity, I'd like make my mail servers more resilient to this kind of situation, and the outages list of all probably should be, too. - Jürgen _______________________________________________ Outages mailing list Outages@outages.org https://puck.nether.net/mailman/listinfo/outages