What are the top SPF errors in cold email?

Multiple v=spf1 records (most common), +all qualifiers, and lookup limits over 10 — all silently kill deliverability.

How do I check my domain's DKIM for Microsoft 365?

Run `dig CNAME selector1._domainkey.yourdomain.com +short`. No result

Is DMARC required for cold emails to land in inbox?

Not strictly, but without it, auth fails default to spam. Start with p=none; ramp to reject for protection.

Will fixing DNS boost my cold email open rates?

Absolutely — from 10-20% to 40%+, per benchmarks, as Gmail/Outlook trust rises.

⚙️ DevOps & Platform Eng

67% of Cold Email Domains Flunk DNS Audits: The Silent Killer of Your Deliverability

Two-thirds of cold email domains are DNS disasters waiting to happen. Here's the data-driven autopsy — and how to resurrect yours before revenue vanishes into spam folders.

theAIcatchup Apr 08, 2026 4 min read

Bar chart of top 5 DNS authentication errors in 1,000+ cold email domains

⚡ Key Takeaways

67% of audited cold email domains had critical SPF, DKIM, or DMARC errors, causing silent spam routing. 𝕏
Top fixes: Merge multiple SPF records, add DMARC p=none, replace +all with -all, limit lookups, activate DKIM. 𝕏
Automation like MailDeck's is essential; manual DNS setup fails routinely in high-stakes cold outreach. 𝕏

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theAIcatchup

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#DKIM DMARC #DMARC setup #DNS authentication #SPF DKIM DMARC #SPF errors #cold email #email deliverability

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Originally reported by dev.to

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