As far as I can tell, they are still using Oracle’s flavor of the Sun Internet Mail Server, which was such a piece of unfettered crap when I had to run it in 19

As far as I can tell, they are still using Oracle’s flavor of the Sun Internet Mail Server, which was such a piece of unfettered crap when I had to run it in 1999-2004 that we had to set up proxy MTAs in front.