Whitelist emails refers to the activity whereby you add a sender to your approved senders list. This tells your email client that you know this sender and trust them, which will keep emails from this contact at the top of your inbox and out of the junk folder.
This is done to ensure you don't have to search for the email for the whitelisted senders in your spam or junk folder
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Whitelisting email is an indicator for Permission-based marketing
When you whitelist a sender, you are sending a signal the email client that you trust this sender and that they have permission to send you emails.
Co-founder of Specflux Solution, he builds IT products that work. He is also running Ipoh based website design agency with his partner. If not working on client's project, he's a part of a vibrant IT community in Ipoh locally known as Digital Perak.