(sorry for the massive cross-post - if you answer, please reply only on one mailinglist)
TL;DR: If you sent a mail to one of the openSUSE mailinglists yesterday and it didn't arrive, please re-send it. Please also re-send any mail you sent to email@example.com or firstname.lastname@example.org yesterday.
As you probably noticed by observing the silence in your inbox, the mailinglists were down yesterday.
This downtime which had two reasons:
a) postfix not starting on our outgoing mailserver after a kernel update and reboot - one of the server's IPs wasn't configured fast enough on boot and prevented starting postfix
b) our mailinglist software needing additional AppArmor permissions after a kernel update. This is a known change for newer kernel versions, but shouldn't happen as part of a kernel update, therefore I opened https://bugzilla.opensuse.org/show_bug.cgi?id=1142120
The downtime started around 7:00 UTC (9:00 CEST). I noticed it in the evening, and around 21:50 UTC (23:50 CEST) everything worked again.
a) wouldn't be too bad - the sending mailservers queues the mails, and they "just" get delayed.
Unfortunately issue b) is more problematic - it seems the mailinglist software failed with $? = 0 so postfix thought the mails were successfully delivered, but in fact they are more or less lost. (Our mailinglist admin found them in the incoming/ directory, but he's on vacation with terrible internet access and probably can't do much about this in the next days. Sending out the then-old mails when he's back doesn't really make sense IMHO.)
Therefore: If you sent a mail to one of our mailinglists yesterday and it didn't arrive, please re-send it. Please also re-send any mail you sent to email@example.com or firstname.lastname@example.org yesterday.