Cisco Cisco Email Security Appliance C390 Mode D'Emploi

Recipients that have been denied receiving into the 
delivery queue due to the Recipient Access Table 
(RAT), or unexpected protocol negotiation including 
premature connection termination.

Messages that have been denied receiving into the 
delivery queue due to a filter drop action match or 
have been received by a Black Hole queuing listener. 
Messages directed to 

 

/dev/null

 entries in the alias table also are 

considered dropped messages. Messages dropped by 
anti-spam filtering (if it has been enabled on the 
system) also increment this counter. 

Number of soft bounce events —  a message that soft 
bounces multiple times has multiple soft bounce 
events.

Total of all hard bounced recipients, delivered 
recipients, and deleted recipients. Any recipient that 
is removed from the delivery queue.

Total of all DNS hard bounces, 5XX hard bounces, 
filter hard bounces, expired hard bounces and other 
hard bounces. A failed attempt to deliver message to 
a recipient that results in immediate termination of 
that delivery.

DNS error encountered while trying to deliver a 
message to a recipient.

The destination mail server returned a “5XX” 
response code while trying to deliver a message to a 
recipient.