SmarterMail also have Spam Filtering, we can enter which domain are trusted and mail, and which one isn’t.
The one classified as not trusted can be given an action such as move to junk mail or delete the mail.
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Click on Settings on the top bar to navigate through.
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Select Spam Filtering on the left hand side of the bar.

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Click on Trusted Domains to whitelist every mail from that domain or address.
For example :


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You can select actions for blocked domains and senders.
