Knowledge Bank

From how to best plan and execute a server migration through to utilising MySQL replication, this section is full of white papers and best practice guidelines, produced by the experts here at ForLinux to help you get the most from your Linux server.

Using SPF records


Using SPF records as a form of e-mail validation is a highly effective method of tackling the problem. They are relatively easy to set-up, and just need adding to your existing DNS records. This white paper explains the basic principals behind SPF, and describes how to go about setting up your own records.

Sender Policy Framework (SPF) is a method of e­mail validation designed to reduce spam.  It does this by addressing a security flaw in Simple Mail Transfer Protocol (SMTP) that allows sender addresses to be forged. Often referred to as 'e­mail spoofing', this allows a computer to send an email with a fake sender address to disguise it's true address.
This paper will look briefly at how 'spoofing' works, and the methods that SPF uses to address the security issues with SMTP. It will include a description of the SPF record syntax and details of how to set up some basic records. Throughout this paper all examples will use the current version of SPF – also known as SPFv1 or SPF Classic.

Get In Touch...