What Is Graylisting?
You've probably heard of allowing listing when a server takes an IP address and adds it to a database. But what if your server didn't just add the IP address to a database? What if it said all your IP addresses and other routing information? Well, that's graylisting! Greylisting is a process for spam reduction or filtering that involves the temporary strategic rejection of a sender based on that sender's IP address and additional routing information. A server that uses a graylisting strategy will take in the sender's IP address and other routing information and attempt to match it against a database. The server will issue a temporary rejection error code if there is no match. Graylisting is based on the notion that a legitimate server will receive the rejection and send the message again. In contrast, a spamming server will likely write off the recipient's email address as invalid. It is highly reliable, secure, and efficient for transferring large volumes of email. With a growing emphasis on email security, more businesses are adopting Email TLS (a. k.a. Email Encryption) to protect their email communications. TLS is the same technology that is used to secure Internet websites. Email TLS allows businesses to connect their email communications to protect them from external threats. Email TLS encrypts email communications, which means that the messages are converted from a plain text format that anyone can read into a format only intended recipients can read. The benefits of email TLS are the same as website TLS: - Emails are protected from external threats - Businesses can protect the integrity of their email communications. Graylisting, according to critics, is simple for spammers to get around because they can program their spamming servers to resend rejected messages. But perhaps more importantly, graylisting can effectively destroy the utility of email as an instant communication if it leaves all or most messages for a long time.
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