39 votesRyan S commented
These apps try a multitude of options to get in. They try a multitude of vectors to get in (ActiveSync, IMAP, POP, EWS) until they are successful or fail.
The way I blocked them is:
- Disable IMAP & POP (Turning on for accounts that need it)
- Turn on EWS BlockList on all mailboxes
- Add rogue apps to the Blocklist (CloudMagic, Aqua Mail, BlueMail).
[This will be a bit of whack-a-mole when they pop up.]
- Disable EWS Mac options (Mac Outlook & Entourage), again enable on mailboxes that require them.