Emails stay in Drafts folder after sent

You are correct in assuming the drafts should disappear once sent. Not sure why yours remain. However, in your mail preferences, accounts be sure in the mailbox behavior that the drafts is not in the "on my Mac" section but under your email address section from where you send out emails..

Thanks for reaching out, Chris Conroy.

It sounds like you're seeing drafts in your Mail app on your Mac. We can help.

According to Save draft emails in Mail on Mac: "For Exchange and IMAP accounts, drafts are stored on the mail server (unless you select a mailbox on your Mac in the Mailbox Behaviors pane of Mail preferences)." So, we'd like to see what happens if you delete the drafts on your Mac and then update your settings to leave drafts on your server instead.

Give that a try, and see if there is any improvement.

We are here for you.

Thanks for following up, Chris Conroy.

That's exactly right. We want to remove the folder on your Mac, and then update settings to leave drafts with your email provider instead of downloading to the Mac.

Keep us posted.