Connection Checks (Connection Checks Overview, Connection Checks) has the capability for the following two types of validation checks:
Action on Match
The Administrator also controls how many matches are required for the action to be taken. The actions allowed are as follows:
Note: For Administrators using Archiving, deleted messages will still archive the message.
The action "Only Add X-Header" allows Administrators to test and review messages that have matches from the Realtime Domain Blacklists or failed Verification Checks that were set. An X-Header is inserted in the message for every match made to a realtime domain blacklist or failed verification check. The e-mail is then passed on to content filtering for further examination. The message is delivered if no other rules processing takes place.
For the action "Reject Connection" and "Delete Message" each spam database listed in the Realtime Domain Blacklist that identifies the sender as spam counts as a match and each validation check failure counts as a match. The Administrator must decide at what point the total match count necessitates action to be taken. See Example.
Note: Realtime Domain Blacklists are not enabled by default.
Realtime Blacklists must be configured at the system level to be available for use at the domain level. Realtime Domain Blacklists can then be added, (for IP'd domains only) where administrators can choose which system level blacklists to enable for the selected domain.
After a blacklist is added, it displays in the Realtime Domain Blacklist. The blacklists that are available to add are dependent upon which blacklists are configured at System > Realtime Blacklist.
Important: Realtime Blacklist must be setup at the system level for it to be available for selection at the Realtime Domain Blacklist (Connection Checks).
Once Realtime Domain Blacklists has been saved, and the message reaches the set match count (total matches on realtime domain blacklists plus the number of enabled verification options), then the message will be handled by what action is set.
The action "Only Add X-Header" allows Administrators to test and review messages that have matches from the Realtime Domain Blacklists or failed Verification Checks that were set. An X-Header is inserted in the message for every match made to a realtime domain blacklist or failed verification check. The e-mail is then passed on to content filtering for further examination. The message is delivered if no other rules processing takes place.
A match made for a Trusted blacklist will immediately either delete or reject the message (includes action Only Add X-Header) depending on the Verification Checks setting for Blacklists.
Trusted Blacklist displays the server where the domain resides, and its query domain. The query domain usually matches the server domain name. However, sometimes a blacklist will contain multiple zones to query on the same server. When this happens, the server name and the query domain will be different. The only way to know this is to read the documentation for the blacklist being used.
Note: After matches are made on the Realtime Domain Blacklist; and match criteria has not been met then set Verification Check options will also be checked.
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