You can define a list of comma-separated email domains such that the system allows sending emails to only those domains. Outgoing emails to any other domain i.e. other than those listed will be prohibited.
Procedure:
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Login to the system and select PC from the product navigator.
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Under the General Configuration section → Email Gateway → Enable Outgoing Domain Whitelisting.
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Provide a list of email domains to be white-listed. Separate them with commas.
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Click on Save.