Step 1: Login to your cPanel account and find Spam Filters. 

Step 2:Click on “Show Additional Configurations” at the bottom.

Step 3:Next, click “Edit Spam Whitelist settings”.

Step 4:Click “Add A New “whitelist_from” Item”.

If SpamAssassin often blocks certain email senders and marks its emails as spam (incorrectly), it is possible to add the sender to the whitelist via Edit Spam Whitelist Settings.
To whitelist a specific sender, just enter it into the whitelist_from field:

Step 5:Add the domain you wish to use.
It is possible to add some email addresses or domains to the whitelist using the Whitelist (Emails Always Allowed)
Step 6:Finally, click “Update Whitelist (whitelist_form)” to save the entry.

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