Strange problem with default mail account
It still behaves normally on my computer, so I don't think it's a change on ATT's end.(These are not messages I've already read on another device, so it's not likely to be some IMAP-ish change on the server side, either.) None of my mail settings are any different than they have been. Other mail accounts via the same server still behave normally. I've tried re-syncing, power cycling, restoring, and nothing has made any difference.
iMac C2D 2.16, iMac G5 2.1, flat panel imac 700, ibook G4 1G, Performa 6116CD, Mac OS X (10.6.4)