![]() SPF records require administration-someone actually adding new IP addresses and removing old ones, and time for the record to propagate across the internet every time a change is made. However, this method isn't perfect, which is part of why it didn't catch on completely. The SPF record is an example, and ideally it would make sure all the mail servers on the internet knew that people sending email from, say, were actually authorized users and computers. Those records tell the world which computers to talk to depending on what they want to do (email, web, FTP, and so on). When you register a domain, you also register a number of DNS records that go along with it. Over the years, SPF records have evolved (the most recent RFC was published in April 2014), and most domains on the internet have SPF records (you can search for them here). The burden of deciding the outcome was completely in the hands of the receiving server. If the IP addresses did not match, then the email would be flagged as spam or rejected altogether. If the two IP addresses match, then the email could pass through to the intended recipient. ![]() It's called the Sender Permitted Form (renamed to "Sender Policy Framework" in 2004), and Matthew explains how it works:Įach time an email message was sent, the receiving email server would compare the IP of origin for the message with the IP address listed in the SPF record for the email address’s host (the part.) In 2003, Meng Weng Wong proposed a way for mail servers to "verify" that the IP address (the unique number that identifies a computer on the internet) sending a message was authorized to send mail on behalf of a specific domain. Spam was still a huge problem that mail servers had yet to seriously tackle, much less develop advanced tools to manage. ![]() Back in the early 2000s, though, that wasn't the case. ![]() Gmail and Outlook have strong, sophisticated spam catching algorithms and powerful filtering tools. Today, most email providers have the spam problem resolved-at least to their own satisfaction.
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