Exchange 2013 recipient filter working bad

Question

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:[email protected]
<<<250 2.1.0 Sender OK
>>>rcpt to:[email protected]
<<<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:[email protected]
<<<250 2.1.0 Sender OK
>>>rcpt to:<[email protected]>
<<<250 2.1.5 Recipient OK
>>>rcpt to:<[email protected]>
<<<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

Answer 1

Hi,
I noticed that the issue happened when you released quarantined messages to their intended recipients by using the Send Again feature in Microsoft Outlook.
Does the issue happen to all quarantined mailboxes. Please confirm if the messages have been sent to the intended recipients successfully or sent failed with NDR returned because of the wrong email address.
Please try to
disable the mailbox quarantine then enable to check whether the issue persists. Also make sure there is no third-party program installed in Exchange server and local machine for quarantine mailboxes.
Regards,
Winnie Liang
TechNet Community Support