I need to configure client certificate requirements on my email sync
I am seeing a lot of brute force password attempts against the UCS Kopano mail server’s ActiveSync.
I was seeing it on the mail portal before, but added a google authenticator inside my reverse proxy for the URLs.
OTP is not an option on ActiveSync.
My clients are Microsoft Outlook, Windows 10 Mail, iPhone, and Android.
I am looking for setup/configuration instructions for client certificate setup.
I am currently also looking at forcing users through a per-app OpenVPN but that solution is chewing up a ton of battery on my test device and it is not very use friendly.