Well, at the risk of replying to my own post above
I thought I would shoot out an update... This evening and afternoon sending pics via e-mail attachment (at 640 x 480 resolution in the Fine setting) have now been going as expected-- going to a check mark from the Send click in about 30 seconds average. Perhaps there was some hiccup or heavy traffic this morning... Anyone who posted earlier, since this thread has been quiet all day, did it just start working for you guys too?