421 too many emails from this sender error in Queue Viewer

Note : This will applies if you are using Barracuda SPAM & Virus Firewall in your Organization.

Problem :

When you verify your exchange server 2007/2010 Queue Viewer it shows you an error like the following.

421 too many emails from this sender

Solution:

Log in to the Barracuda Spam & Virus Firewall and do the following.

Click on  the BLOCK/ACCEPT tab and select RATE CONTROL add the recipient E-mail ID in the
Rate Control Exemption Sender Email Address (Outbound Only) wizard and click on Save Changes.

Thanks & Regards,
             R2