Complete guide to sending email to Google: Rules, signals & setup

Summary

Sending email to Google requires understanding differences between consumer Gmail and Google Workspace, plus the authentication and reputation signals used by Google’s filtering systems. The guide says SPF and DKIM are required for all senders, while DMARC is required for senders exceeding 5,000 messages per day to Google inboxes; it also gives a bounce example for missing alignment. It recommends keeping user-reported spam below 0.1%, never reaching 0.3%, and providing one-click unsubscribe handling. Google Postmaster Tools reports compliance, spam rate, authentication success, and delivery errors, while the Feedback-ID header enables aggregate complaint analysis by campaign or sender ID. Workspace administrators can apply additional filters, so successful delivery to Gmail does not guarantee placement in a corporate Workspace inbox.

Takeaways

1. 1

   SPF and DKIM are required for all senders, while Google requires DMARC for senders exceeding 5,000 messages per day to Google inboxes.

2. 2

   The guide sets a target spam rate below 0.1% and says rates should never reach or exceed 0.3%, where inbox placement may degrade or messages may be deferred.

3. 3

   Google Postmaster Tools provides aggregate metrics, and the Feedback-ID header lets senders analyze complaints by campaign, message type, or sender ID without receiving individual complaint data.