Even more precisely, SPFv1 allows the owner of a domain to specify their mail sending policy, . which mail servers they use to send mail from their domain. The technology requires two sides to play together: (1) the domain owner publishes this information in an SPF record in the domain's DNS zone , and when someone else's mail server receives a message claiming to come from that domain, then (2) the receiving server can check whether the message complies with the domain's stated policy. If, ., the message comes from an unknown server, it can be considered a fake.
To write an essay introduction, first start with a relevant anecdote, fun fact, or quote that will entice people to keep reading. Follow your opening with 2-3 sentences containing background information or facts that give your essay context, like important dates, locations, or historical moments. Then, introduce your thesis statement. Make sure your thesis statement is specific and provable and that it answers a question about your essay topic. For more advice from our reviewer, like how to come up with a good hook for your first sentence, read on!