Hello,
Are your Barracudas dropping connections from a legitimate sender with the following error?
421 Error: too many messages in one session
If you are deferring connections from a sender and believe that it is legitimate traffic you can go to the Advanced -> Email Protocol tab and increase the value of Messages Per SMTP Session to a more appropriate value for your mail hosting environment.
Are your Barracudas dropping connections from a legitimate sender with the following error?
421 Error: too many messages in one session
If you are deferring connections from a sender and believe that it is legitimate traffic you can go to the Advanced -> Email Protocol tab and increase the value of Messages Per SMTP Session to a more appropriate value for your mail hosting environment.