Office 365: Stop One User Sending Attachments
KB ID 0001544 Problem If you have one, (or more) users and you want to BLOCK those users from sending ANY email attachments, here’s how to do it; Solution Log into your Office 365 tenancy with administrative access > Admin > Admin Centers > Exchange Admin > Mail Flow > Rules > Add > Filter Message By Size. Name: Give it a sensible name. Apply This Rule If: The message size is greater than or equal to = 1.00...