As email is an integral part of day-to-day communication, it is important to make sure that it is secure and free of spam. Greylisting is one of the methods used by South African ISPs to help protect their customers from the dangers of spam and other malicious emails. In this article, we’ll take a look at what greylisting is, how it works, and why it is important in South Africa.
What is Greylisting?
Greylisting is a method often used by ISPs in South Africa and elsewhere to reduce the amount of spam and other malicious emails their customers receive. It works by temporarily blocking emails from any sender that is not in the ISP’s whitelist. When an email is blocked, the recipient will receive a notification informing them that the email has been temporarily blocked. The sender is then asked to resend the email after a certain amount of time has passed.
Greylisting works by requiring that the sender of a particular email is authenticated before it is allowed to pass through to the recipient. This is done by verifying that the sender is a legitimate sender and not a spammer. If the sender is not authenticated, the email is blocked. This helps to reduce the amount of spam and other malicious emails sent to customers.
How Does Greylisting Work?
Greylisting works by temporarily blocking emails from any sender that is not in the ISP’s whitelist. When an email is blocked, the recipient will receive a notification informing them that the email has been temporarily blocked. The sender is then asked to resend the email after a certain amount of time has passed.
When the sender of the email tries to send it again, the ISP will check to see if the sender is a legitimate sender. If the sender is authenticated, the email will be allowed to pass through to the recipient. If not, the email will be blocked again. This helps to ensure that only legitimate emails are allowed to pass through the ISP’s network.
