MS Exchange 2010 queue full problem

Hello Dears,

I need one important help. My server is MS Exchange 2010 and there's too many invalid request in my queue. How to protect my email server from,,,, ... etc?
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AmitConnect With a Mentor IT ArchitectCommented:
You can install forefront for Exchange. That will help to fix all these issues.
Enable antispam feature and configure it in exchange 2010. Check this from and
itsbmAuthor Commented:
Thank you R-R, but i already installed anti-spam.

Thank you amitkulshrestha, it's possible to install with Kaspersky Security fot Microsoft Exchange? And can you tell me how to find DNS query failed log from my exchange server's logs?
AmitIT ArchitectCommented:
Yes you can use Kaspersky Security fot Microsoft Exchange, Also you issue more look to be DNS related, check below article from MS

How to check
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