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HubSpot sends a genuinely enormous volume of email and publishes what they tell their own customers to do to stay out of spam. It is a clean checklist covering authentication, list hygiene, and engagement monitoring, useful as a second, ESP-side view alongside Google's own sender guidelines.
Improve email deliverability
- Connect and authenticate your sending domain with SPF and DKIM before you send at any volume
- Regularly prune unengaged or invalid contacts, they drag your sender reputation down
- Watch your open and click rates over time as an early warning of a reputation problem
