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If our system has marked an incoming email as Spam, but you are sure it is a legit email, you can whitelist the sender straight from the Webmail.

Mark email as legit (Not Spam)

After you log in to your Webmail:

From the Spam folder, right-click on the Spam email you wish to mark as legit.
Click on the Move to Inbox folder option to whitelist the sender.
All incoming emails from this sender will be delivered to your Inbox (or another folder if you have set up a rule).

If you have whitelisted a sender, but incoming emails are still delivered to your Spam folder, make sure there is no Blacklist entry for this sender or domain.