To bounce a message that is identified as spam, you must set up a delivery rule at the host level. Before you setup a rule, determine the reason you want to bounce spam messages and identify the corresponding X-IMAIL-SPAM header that is inserted into these types of messages (i.e. X-IMAIL-SPAM- DNSBL). If you want to bounce all spam messages regardless of the reason it was identified as spam, you need to create a rule or rules that search for the generic X-IMAIL- SPAM header. For more information, see Spam X-Header Explanations.
Example:
The following example assumes that you want to bounce all messages that are identified as spam.
To bounce a message that is identified as spam:
Field: Header
Comparison: Contains
Search Text: X-IMAIL-SPAM