>i used to have this problem but never found a reason, but never looked into it in great depth. you can change the account you are sending from when composing the email, there should be a drop down at the top of the email message that you can select from.
I forgot to mention that I do this all the time; but of course, every now and then, I forget (just as I say, for instance, "I am including that-and-that", and then forget the attachment <g>).
I might experiment, one day, deleting one of the accounts and re-creating it - or both.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)