Check actions

When a certain check module thinks the message is "bad", it takes some actions depending on its configuration. Most checks follow the same configuration structure and allow following actions to be taken on check failure:

Useful for testing deployment of new checks. Check failures are still logged but they have no effect on message delivery.

Reject the message at connection time. No bounce is generated locally.

Mark message as 'quarantined'. If message is then delivered to the local storage, the storage backend can place the message in the 'Junk' mailbox. Another thing to keep in mind that 'target.remote' module will refuse to send quarantined messages.