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Open rates are lying to you: metrics sponsors care about

Aug 20, 2026 · 1 min read · by bren-kinfa

Apple Mail inflates opens by 20 to 30 percent. Here are the numbers that actually predict sponsor renewals.

What we looked at

This article summarises what we see across the SaaS Newsletters database and marketplace. It is written for newsletter operators and the brands that sponsor them, and it will be updated as new listings come in.

Key takeaways

Price on audience fit and engagement, not list size alone. Publish a simple media kit. Make it easy for sponsors to book a slot, and follow up within a day.