[mfincham]

The classic metzdowd cryptography list is generally good reading: https://www.metzdowd.com/mailman/listinfo/cryptography

Another good fly-on-the-wall place to see what's going on in a specific tech niche is the dns-oarc operations list: https://lists.dns-oarc.net/mailman/listinfo/dns-operations

[MattPalmer1086]

Seconded for Metzdowd, often very interesting.