I have three different email accounts that I use: Work, Personal, and School. I have all three set up on the Mac Mail app, and incoming messages seem to work. However, when I compose a new message, I select the "From" account to be from work. Unfortunately, even when I do that, the email is sent from my Personal email address, not my work email. So now I'm left responding to work emails from my personal account, and at times have clients/co-workers asking who I am, since they don't recognize the email sender's account. As you can imagine, this can get pretty annoying/frustrating. The odd thing is, under Sent messages on the Mail app, the emails show up under the appropriate tab, even though they show up to my recipients as having being sent from my Personal account. Any ideas what may be causing the issue?