10.8.2; Mail 6.1: just confirmed that Mail.app is sending email from the wrong account. Anyone else?
@mclow: @jeffporten Is it sending from the wrong account when you’ve explicitly chosen, or just choosing the wrong account by default?
@mclow Explicitly chosen. Sent from the default account instead.
@jeffporten Then I don’t know. I haven’t seen that behavior.
@mclow I’d be happy to hear your default fix, in case that helps.
http://www.mcelhearn.com/2012/08/02/bug-in-mountain-lion-mail-sends-replies-using-incorrect-accounts/
Here’s where I saw this. There’s a link to Apple discussion board on that page, which indicates it started in 10.8.0 and isn’t fixed yet.