I own an Early 2011 MacBook Pro running OS X 10.9.1. I have configured two email accounts with my mail app(one hotmail and another gmail), and both use imap. The problem is that when I send an email to a particular person, the app sends two mails(one duplicate) in place of one. Please help.
EDIT: Upon some troubleshooting I found that this is a problem only with hotmail, my gmail account is working fine.
EDIT: It has fixed by itself. All I can surmise is that there was a problem with the hotmail imap.