Gmail & Yahoo Bulk Sender Requirements: The DNS Checklist
What Gmail and Yahoo’s bulk sender rules actually require in your DNS, and how to check SPF, DKIM, DMARC and PTR records so your mail doesn’t get rejected or throttled.
MXCorrect Blog
Practical guides on DNS, SPF, DKIM, DMARC and email deliverability.
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DNSSEC Basics: Do You Need It for Email Security?
DNSSEC doesn’t replace SPF/DKIM/DMARC — it protects the DNS lookups underneath them. Here’s when it’s worth enabling.
MX Records Explained: Priority, Multiple Records and Common Mistakes
What MX priority actually controls, why you need a fallback record, and the mismatch mistakes that silently break mail delivery.
Why Is My Email Going to Spam? A DNS-First Checklist
Before blaming your content or sender reputation, run through this 8-point DNS checklist — most deliverability problems start here.
DKIM Explained: How It Works and How to Set It Up
How DKIM signing and verification actually works, how to publish your first selector record, and the most common setup mistakes.
DMARC p=none vs p=quarantine vs p=reject: Which Should You Use?
A practical rollout path from monitoring to full enforcement, and the alignment mistake that trips up most DMARC deployments.
SPF Record “Too Many DNS Lookups”: How to Fix the 10-Lookup Limit
Hitting an SPF permerror from too many DNS lookups? Here’s what counts toward the 10-lookup limit and exactly how to flatten your record.