Question
How to whitelist a domain in a Plesk server antispam settings?
Answer
Solution 1
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Go to Tools & Settings > Spam Filter > White List and add the required domain.
Solution 2
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Go to Domains > example.com > Email Addresses > <email_address> > Spam Filter > Show Advanced Settings
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Add required domain IP address in Trusted Networks section.
Additional information
Plesk documentation: Spam Filtering Configuration on the Mailbox Level
How to manage spam settings in Plesk via CLI?