When I compose a new message, I have 4 email address choices in my "From" drop down combo box. It doesn't matter which email address I select in "From", it always uses the one in the bottom of the list. I've confirmed that it isn't just a display issue by examining a message on the recipient's computer. If my explanation is confusing, here's a fictional example: I'm composing an email in the "New Message" dialog. I click on the combo box to the right of "From" and it shows from top to bottom: Bird <firstname.lastname@example.org> Cat <email@example.com> Dog <firstname.lastname@example.org> Mouse <email@example.com> No matter what I select in "From", the recipient will always receive an email from "firstname.lastname@example.org". Has anyone else has had this issue? You might not notice it until you get a reply to an email you originated and check the original "From". I filled out a bug report with Apple but of course I haven't received any feedback.