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Email sender rules for Gmail, Yahoo and Microsoft

Gmail, Yahoo and Microsoft (Outlook.com) each publish rules for anyone who sends email to their users. Since 2024, these rules have become stricter, mostly for large senders. If you send many messages a day to personal Gmail, Yahoo or Outlook.com addresses, you need to authenticate your mail with SPF, DKIM and DMARC. Gmail and Yahoo also ask bulk senders to offer one-click unsubscribe and to keep spam complaints low. If you don't follow the rules, your mail may go to spam or be rejected. This page puts the main rules side by side, in plain words. Each provider page goes into more detail and links to the provider's own text. We check the sources regularly and note every change in our changes log.

See what changed and when

This is our summary, not the provider's official text. Rules can change; always check the linked source.

How we keep this up to date

We read each provider's own public pages and write a plain summary. Every rule links to its source, and each page shows the date we last checked it. When a provider changes a rule, we update the page and add an entry to the changes log.

Last updated 10.11.2026 19:01 IL (10.11.2026 17:01 UTC)