Disabling external POP/IMAP access

[theklone]

Is it possible to prevent users adding external accounts in the webclient?

I've unchecked "External POP/IMAP access" in the CoS but it only disabled external POP access, it is still possible to add external IMAP accounts.

Have I missed something obvious?

[uxbod]

You may wish to vote for Bug 27744 - Disable POP/IMAP external access from COS not apply to users