Category Archives: Spam Filter

Release deferred emails in Barracuda Spam & Virus Firewall 300 – KB10391570


Description:  Client has recently had a problem with Exchange and mail stopped flowing.  The Barracuda 300 will store the emails until the Exchange server is back up and running.

Common customer description: Our Exchange server stopped flowing mail and that has been resolved but we are missing emails during the time the Exchange server was down.

Probing questions: Check to see if the client uses a Barracuda Spam Filter system.

Steps to isolate: If the client does use a Barracuda Spam filter system and it is the 300 model, listed below are the steps to release the deferred emails.

Steps to resolve:

1: Log into the Barracuda 300 unit (this will be a local device) by typing in its IP address into a web browser with https:// at the beginning.

2: Click in the Advanced tab along the top menu bar.

3: Click on Queue Management.

4: You should now see emails listed as deferred.  Click on the “Tools” drop down menu just below the search box.

5: Next mouse over “Message Actions” then click on “Requeue All”.

Once that is completed a green bar just above the search box should state something to the affect of the emails have all been placed back into the queue.

Additional considerations: Please note that the more emails that are stuck in the queue the longer it will take to process them.  The Barracuda 300 model holds all emails and once placed back in sending status it checks them for spam.  So if the client had 300 deferred emails there is a good chance some of them are spam or unwanted in some fashion.



Emails with attachments are delayed – KB10391041


Description:  Emails are being delayed by hours or even days.

Common customer description: We are receiving emails a lot later than we should.  Sometimes days later.

Probing questions:

When did this start?
Did you recently get a spam filtering service like Securence?
Is everyone affected?
Do the emails that are delayed have attachments?

Steps to isolate: If the client recently signed up and started using a spam filtering solution make sure emails without attachments arrive on time.  If regular emails arrive quickly but emails with attachments are delayed proceed to the next step.

Steps to resolve: Check Exchange and the clients firewall for spam filtering and virus scanning attachments.  Since Securence and other name brand spam filtering solutions scan the emails for infections along with spam, these tasks do not need to be performed in Exchange or on the firewall.

Additional considerations: It has been found that once the spam filter solution is finished scanning the email it opens a socket with the Exchange server.  Exchange is expecting the email to be transmitted within a certain amount of time.  If something like a firewall is also set to scan attachments prior to allowing the transmission Exchange will close the socket due to timeout.  Eventually the email will get sent through if enough attempts move fast enough to beat the timeout.  Better to just leave the filtering to the spam filtering service.