I've been using outlook express as my newsreader for some time.
Just today, when trying to post, I started getting an error message
like this:

Outlook Express could not post your message Subject ' power supply
explanation'. Account 'nntp.aioe.org' Protocol: NNTP. Server
Response: '441 Nonexistent group'. Port 119 Secure (SSL): No Server
Error: 441, Error Number: 0x800CCCA9

I get a similar error message when trying to post through teranews.

I get online only through public wifi hotspots. I don't have a
service provider at home or at work, and I use aioe and teranews.

I doubt if aioe and teranews have both disappeared simultaneously,
although anything's possible.

Assuming the problem is a glitch in outlook express, can someone
suggest how I should fix it?