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Sender Policy Framework — Википедия Spam Resource: Backscatter: What is it? How do I stop it? Free email gateway and anti-spam service Anti-spam techniques - Wikipedia Exim — Википедия SPF: Implementations - GoDaddy DNS - CNAME, MX for Zoho Mail DKIM Key Checker – protodave SPF: Project Overview - Sender Policy Framework (SPF) Contact Form 7 Email Issues - CF7 Skins KB If the DNS Manager for your domain is hosted with GoDaddy, follow the steps below to add a CNAME and verify the domain. Login to your GoDaddy DNS Manager. Various anti-spam techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has Framework for publishing information through DNS describing a list of ip addresses allowed to send emails from a specific domain. Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience. Still have questions? If you still have questions on your Contact Form 7 Email Issues, after reading and working through the information provided in this What is it? Backscatter is a certain kind of mail you receive that you didn't ask to receive. If you've ever received a “Your mail could not be delivered Exim (от англ. EXperimental Internet Mailer) — это агент пересылки сообщений, используемый в Принцип работы. spf позволяет владельцу домена, в txt-записи, соответствующей имени There are several SPF libraries available. Many mail servers support SPF natively. Most popular mail servers also have extensions or unofficial patches Selectors enable a single domain to have multiple keys. Some domains, like Twitter and eBay, use “dkim”. Google Apps domains typically use “google”.