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What is Greylisting?

Greylisting is a system used to reduce the amount of unwanted Spam emails that you might otherwise receive.

It works by rejecting the first attempt to deliver any emails sent from unknown email addresses and IP addresses. Usually mail servers that are sending spam will have been discovered and blocked by the time they try to send the message again.

Providing that known and untrusted email addresses/IP addresses are Whitelisted, then they will be delivered to your Inbox promptly.