Sep 07 2018 05:55 AM
Sep 10 2018 01:19 PM
Hi Sue,
I would revoke all tokens and then disallow all email sending of mails larger than 0 KB for the user. This might be a quick solution.
Exchange Admin Center > User > mailbox features > message size restrictions > maximum message size (KB) > 0
Revoke the tokens with AzureAD cmdlets:
Revoke-AzureADUserAllRefreshToken
Revoke-AzureADSignedInUserAllRefreshToken
give it a try.
best,
Oliver