Google Postmaster Tools
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Google Postmaster Tools offers senders a direct line to Google's view of their domain and IP reputation. The free dashboard shows authentication results, spam complaints, and delivery errors for mail sent to Gmail addresses, giving you concrete feedback on your sending health.
It's built into Google's ecosystem, making it essential for anyone sending to Gmail at scale. The insights help you fix Gmail-specific issues and maintain a strong reputation with the world's largest email provider.