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Thanks Simon. We only block ActiveSync from users that are not authorized for use. &nbsp;Will look into how Exchange quarantines connections so that we can block 3rd party apps being able to connect to our server.
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Is there a way for me to disable users from using email apps (ex Outlook for iOS, CloudMagic) on their mobile devices to connect to our on-premise Exchange 2013 server via Powershell? &nbsp;Thanks!
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Is there a way for me to disable users from using email apps (ex Outlook for iOS, CloudMagic) on their mobile devices to connect to our on-premise Exchange 2013 server via Powershell?  Thanks!

Disable email apps - Exchange 2013

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.