Hello, I discovered yesterday that our organization was unable to recieve emails sent from external sources. Are configuration is Firewall->Barracuda Spam Filter->Exchange mail server. In my tests so far, I have found that our DNS is correct. Emails sent from an outside source are let through the spam filter. This means that mail is making it through the firewall and then through the spam filter. There they dissapear. The senders are not recieving any type of error message about the email. I have check the queues of the exchange server and can still find no trace of the emails that made it through the spam filter. Any help would be appreciated.