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How to test email deliverability, spam score and rendering

Why Heavy HTML Email Templates Get Lower Inbox Rates in 2026

Discover why bloated HTML email templates harm deliverability and reduce inbox placement. Use MailTester’s inbox-placement tests to validate your emails.

Email deliverability fundamentals and best practices

What Is a Good HTML to Text Ratio for Email Deliverability in 2026?

Discover the true benchmark for HTML to text ratio in emails. Improve inbox placement and avoid spam filters with precise verification and deliverability.