Probably because s/he has those addresses out there in the wild starting from a time that it was still reasonable to run an email server, so like 10+ years and probably a bit more.
That's exactly the case for me, but I've been handing out these addresses for nearly 20 years. I also suffer from the problems with gmail that the GP referred to. I can't even forward all my email to myself without having it dumped into gmail's trashbin!
