Thanks to Landlady.
And I wish to have it known that the problem wasn’t even my fault. The service stopped working when it hit “inbox full,” but I do practice basic file hygiene and my inbox – and junk and trash lists – were anything but full. In fact at the moment they’re completely empty. However for some reason the server retains everything whether I delete it or not, and while I have theoretical access to those lists I would have to know little things like the fact that they exist as well as their address and password before I could fix the problem. Landlady being more cognizant of computer stuff and also able to communicate with the server guy, she bailed me out this morning and I can receive emails again. And I now have that information so the problem shouldn’t repeat.