About Blocking and Allowing
Blocking: No spam checking is performed for domains or email addresses that are added to the block list, they are automatically blocked.
Allowing: Content-based spam checking is not performed for domains or email addresses that are added to the allow list; however front line tests such as RBL, SPF, greylisting, virus checking and attachment scanning are still applied.
The following are important to note when using allow and block lists:
An email address cannot be allowed and blocked at the same time. If you add a sender's email address to a block list that is already on an allow list, they will automatically be removed from the allow list.
Per-recipient allow lists and block lists overrule global allow lists and block lists for a domain. See below for info on list precedence.
Allowed senders bypass the SpamTitan anti-spam engine, however, they will still be scanned for viruses and banned attachments.
Allow and block list sender testing is performed after a message is received, therefore, front line tests such as RBL, SPF or greylisting may still apply.
Allow and Block List Precedence
There are four allow and block list levels in SpamTitan. Each is accessed by logging in at the appropriate access level, or by impersonating that role as your access allows:
Global allow list & block list: applies to all recipient users and domains on the server (not accessible on shared cloud servers).
Domain Group allow list & block list: applies to all domains and recipients in a domain group.
Domain allow list & block list: applies to a single domain and all its users, e.g. example.com.
User allow list & block list: applies to a single recipient. For example, user@example.com.
A Global list is overruled by a Domain Group list, which is overruled by a Domain list, which is overruled by a User list.