> For the complete documentation index, see [llms.txt](https://docs.messageflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.messageflow.com/email/e-mail-campaigns/campaigns/authorization-of-domain-and-senders/authorizing-domains-with-web-hosts.md). # Authorizing domains with web hosts As of February 1, 2024, Gmail and Yahoo are introducing new rules for sender verification and message classification, aimed at increasing the security and effectiveness of spam filtering. These changes require senders to update their settings, such as implementing SPF, DKIM and DMARC protocols, to ensure better deliverability and protection of their email communications. Therefore, we have prepared a guide describing how to add a customized DKIM entry to DNS settings on the side of the most popular web hosts. The instructions can also provide a hint on how to add the other records as well. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.messageflow.com/email/e-mail-campaigns/campaigns/authorization-of-domain-and-senders/authorizing-domains-with-web-hosts.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.