[exim] Blocking Microsoft ESMTP Mail Service

We want to block all emails sent from spamming servers like Microsoft
ESMTP Mail Service.


In ACL HELO how can one match the data in the HELO/EHLO line ? I want
to match 'Microsoft ESMTP MAIL Service' and then drop or reject the
connection.


220 galsrv1.galvatech.local Microsoft ESMTP MAIL Service, Version:
6.0.3790.4675 ready at Wed, 5 Sep 2012 03:29:41 +1000


220 adstudio.co.za Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675
ready at Tue, 4 Sep 2012 19:31:48 +0200


M$ ESMTP MAIL Service does not recognise 550 error codes sent by Exim.
M$ thinks 550 means "try again to send the unwanted junk".

The worse mail abusers, in my experience, use Microsoft ESMTP MAIL
Service. We get about 150 mail attempts every day from each of the
defective Microsoft ESMTP MAIL Service servers, day after day. Their
owners and ISPs are ineffective at halting the abuse.

Thank you.


--
Paul.
England,
EU.