Exchange 2013 recipient filter working bad

Hello,

I have seen, that the recipient filter in Exchange 2013 is working a Little bit different like in the older Versions.

Here an Example (Exchange 2013):

<<<220 EX2013.test.local Microsoft ESMTP MAIL Service ready at .....
>>>helo test
<<<250 EX2013.test.local Hello [192.168.0.10]
>>>mail from:info@testexternal.com
<<<250 2.1.0 Sender OK
>>>rcpt to:invalid@test.local
<<<250 2.1.5 Recipient OK
>>>data
<<<354 Start mail input; end with <CRLF>.<CRLF>
>>>Subject: Test2
>>>
>>>Test2
>>>.
<<<550 5.1.1 User unknown

All other pervious Versions of Exchange 2003, 2007, 2010 are working different:

Look here (Exchange 2010):

<<<220 ex2010.test.local Microsoft ESMTP MAIL Service ready at ...
>>>helo helo test
<<<250 xxxxxxx Hello [192.168.0.20]
>>>mail from:info@testexternal.com
<<<250 2.1.0 Sender OK
>>>rcpt to:<validuser@test.local>
<<<250 2.1.5 Recipient OK
>>>rcpt to:<invaliduser@test.local>
<<<550 5.1.1 Invalid RecipientThis is very simple and more effectiv than the other Strategie, because I won't have data inhouse and then the server decide, if recipient are valid, there is no reason to change this.

Thank you for a help

Bernd