What are the mandatory email authentication requirements in 2026?

Google Workspace, Yahoo, and Microsoft 365 require bulk senders to configure valid SPF and 2048-bit DKIM signatures, publish a DMARC policy with alignment, include RFC 8058 one-click unsubscribe headers, and keep spam complaint rates below 0.3% and hard bounce rates below 2%.

How often should I run an email deliverability audit?

Audit your SPF, DKIM, DMARC, and DNSBL blacklist standing monthly, and verify your recipient list before every cold outreach sequence or quarterly for active newsletter databases.

Interactive Checklist

Email Deliverability Checklist

A comprehensive checklist to ensure your emails reach the inbox. Check off each item as you complete it.

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Email Authentication

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List Hygiene

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Content Best Practices

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Sending Practices

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Deep-Dive Guides for Each Checklist Stage

SPF, DKIM & DMARC Guide →

Configure DNS authentication & alignment

Deliverability Best Practices →

Primary inbox placement & reputation rules

Warm-Up vs. Verification →

Why warm-up alone cannot fix a dirty list

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Interactive DNS & Hygiene Tools:SPF Generator DMARC Generator MX Lookup Blacklist Checker List Hygiene Guide 2026 Catch-All Benchmark Glossary: Deliverability Glossary: Inbox Placement Glossary: Email Warm-Up Glossary: Safe Sender