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Field notes from inside the account.

Long-form on email, SMS, and the programs behind them. What we keep finding, and what to do about it.

All Email Marketing Revenue Optimization Segmentation BFCM Campaign Strategy Deliverability

Email Authentication Failed? Here's How to Fix It (And Why It's Happening)

Since Gmail and Yahoo rolled out mandatory authentication in February 2024, and Microsoft joined in May 2025, thousands of businesses have seen their emails bouncing. This guide shows you exactly how to fix SPF, DKIM, and DMARC authentication issues.

JASON DONAPEL · DEC 7, 2025 · 6 MIN

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Reading is good. Knowing your own numbers is better.

Retention Forensics reads your program the way these posts read the category.

See Retention Forensics

E/XTHE EMAIL EXPERIENCE

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