follow below mentioned steps to white list any specific domain.
Navigate to Anti Spam--> Spam Policy--> Global Policy.
Click on Add.
Select second option "From Domain". Enter your required domain, and select
action as "Accept" for SMTP and POP3 protocol.
This will white list configured domain. Means any mail coming from configured
domain will not be scanned by Anti Spam engine.
Please, make sure this rule should be on top of the all default rules.
Please, refer attached screen shots for your reference.
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