When replying to your own email, account auto-selection does not work. Or in other words, please auto-select the right account when replying to your own email. To replicate: Preferences -> Compose -> Writing -> Automatic account selection [x] when replying At least 2 accounts configured: 1. a@example.com 2. b@example.com (Default) Email comes in: From: c@gmail.com To: a@example.com When replying, compose window picks the right account to reply: From: a@example.com Say you BCC yourself, or the email is to a mailing list and you receive a copy. This email: From: a@example.com To: c@gmail.com Now, when you hit reply to this email, the account selected is the "Default" account, not the right account. From: b@example.com To: c@gmail.com Aside: The To is picked so (rightly IMHO) due to a previously made enhancement. The enh-request/bug is that when responding to one's own email, the right account should be identified and picked up. It should be: From: a@example.com To: c@gmail.com