[LukeShu]

Not a mail server, an individual person's laptop.

> these mails originate from a host called "wolfsschanze", which appears to be the laptop a certain Laslo Hunhold works from (their conf organizer?)

-- the tweet in the thread that you're mentioning

[hobofan]

The same person has also given a talk on their conference with the title "OpenBSD supremacy", which seems like an oddly specific choice of words (though it could also be the result of English as a second language).