[some_furry]

There's an IETF RFC draft for mldsa-44 keys for OpenSSH. https://datatracker.ietf.org/doc/draft-rpe-ssh-mldsa

I'm not aware if it has any real traction, but that's what I found with a quick search.

[mcpherrinm]

OpenSSH's Damien Miller has https://datatracker.ietf.org/doc/draft-miller-sshm-mldsa44-e... defining [e-mail] which seems more likely given the authorship.

[some_furry]

Sure, but that's a composite scheme, and I dislike those. :P