They're Blocking E-Mails
ProLog (Pen Tele Data, PenTeleData, or PTD), which I get through Blue Ridge Cable, started blocking e-mails from Yahoo! on my wife's account, though not on mine. When I complained, they said basically too bad, but that Yahoo! knew what it had to do "to get off of the list."
Plus, they are having more frequent glitches. E-mails to me appear in quadruplicate. There are many momentary outages, so that I have to reconnect to work in the middle of a report.
I've started using my cell phone's Internet connection (AT&T). It's slower, but seems to be more reliable.