Intergation with MDM solutions

[Ram]

I need to integrate cyrus IMAP with a MDM ( Mobile Device Management ) 
solution.
The idea is that even if the IMAP ports are open only selective users / 
devices should be allowed from an external Network.
Internal Network everyone is allowed.

I have seen that ready MDM solutions come up with server side plugins 
for Microsoft Exchange which can help achieve this


Is there a software for Cyrus Imap server that can allow selective users 
/ devices  only ?


Thanks
Ram