A lot of our outgoing mail is getting rejected by recipient servers. I originally thought we were blacklisted but checking with all of the lists, it doesn't look like we are. We have virus checking on our spam filter and it is not seeing anything.
We are using Exchange 2007 and a Barracuda Spam & Virus Firewall.
Some of the return errors:
This message has been rejected due to content judged to be spam by the internet community??IB212 <http://x.co/crbounce
554 Email rejected due to security policies - http://kb.mimecast.com/Mimecast_Knowledge_Base/Administration_Console/Monitoring/Mimecast_SMTP_Error_Codes#554
said: 554 Denied
Thank you for any help you can provide.