TMG 2010 - How to block connection from "Mac Mail" to Exchange Server

Hi,

On our TMG 2010, I would like to block access to our ExchangeWebServices for Mac OS users. I searched the internet and found that you can use HTTP Signatures, to use "Client agent" information to block a connection.
For example "Client agent: Mac OS X/10.8.5 (12F45) CalendarAgent/57"

I have not much experiences with TMG and hoped that someone can help me out hier.

Any comments are appreciated.

Thanks
Joerg
InfrontStaffAsked:
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Jian An LimSolutions ArchitectCommented:
what exchange server you are using?

http://thoughtsofanidlemind.com/2010/08/12/controlling-ews-access-in-exchange-2010-sp1/

or you are interested to blocking this from External but allow internal ?
InfrontStaffAuthor Commented:
We are using exchange 2010 and I'm aware of the possibility of EWS access control. The problem is from outside. We have users that are using Mac mail at home and the mac (for example the calendar) tries to contact the exchange mailbox with the anonymous account and after few tries, our account policy locks the AD account of that mailbox.
Therefore my idea was to block those mac client agent mentioned above.
Jian An LimSolutions ArchitectCommented:
http://patrickhoban.wordpress.com/2013/01/07/0800-5/

this guy has configure something similar

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InfrontStaffAuthor Commented:
Yes this is exactly what I'm trying to do, but I'm not sure what to fill in the "Signature" Field.
I hoped someone has experience with Signatures Filtering.
InfrontStaffAuthor Commented:
The link above gave me the right direction and with the "Trial and Error" principle, I found out what I needed to do.
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