Hi all, Ever since upgrading to El Capitan, my third party email apps (Sparrow, Airmail 2) no longer allow me to send emails using my IMAP .edu account. Importantly, I can do this just fine using Apple mail. The IMAP account settings (security, ports, etc.) are identical between Apple Mail and my third party mail apps, but I am not able to send emails using the third party apps. The only way I can successfully send emails using these accounts with third party apps is to either be on my University network, or use a VPN and get on my University network. Any ideas as to what might be happening? I could provide any logs/console info if necessary.