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Notes on email deliverability from the person who builds and runs this tool. Real messages, real DNS, real headers, and what the report was trying to tell you.
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Email Unsubscribe Footer: Examples, HTML & Best Practices
Learn how to create an email unsubscribe footer with real examples, copyable HTML, and Gmail & Yahoo requirements. Test your email before sending.
Free tools:SPF CheckerDMARC CheckerDKIM CheckerBlocklist CheckerEmail Header AnalyzerMX CheckerBIMI Checker
Email Deliverability News: Latest Gmail, Yahoo & Outlook Updates
Stay up to date with email sender requirements, deliverability changes, and spam filtering updates. See what changed, who is affected, and what to check.Why Are My Emails Going to Spam in Outlook? (And How to Fix It)
Outlook.com, Microsoft 365 and the Outlook app filter mail in different ways. What Microsoft requires since May 2025, what 550 5.7.515 means, and the fixes.Mailchimp Emails Going to Spam? How to Test and Fix Deliverability
Why Mailchimp campaigns land in spam, what Mailchimp's own test email can't show you, and the DNS records and settings that fix it, checked on a real send.WordPress Emails Going to Spam? How to Fix Contact Forms, Notifications and WooCommerce Emails
Why the emails a WordPress site sends land in spam or never arrive, and how to fix it for contact forms, password resets and WooCommerce orders.Google Postmaster Tools: How to Read It Now the Reputation Charts Are Going
Setting up Gmail Postmaster Tools, why its charts start empty, what compliance, spam rate and delivery errors mean, and what I do when spam rate climbs.How to Test Email Deliverability Before You Hit Send
Send a test email the way the campaign really goes out, then check authentication, unsubscribe headers, the sending IP and every link. My routine.Best Email Spam Testing Tools
The email spam testing tools I actually use for real senders, what each one measures, roughly what it costs, and where the one I built fits, bias included.How to Know If Your IP or Domain Is Blacklisted
How DNS blocklists work, which of them receivers actually consult, how to check an IP or a domain by hand, and what to do when you find yourself listed.How to Prevent Emails From Going to Spam in Gmail
What Gmail actually weighs, the rules it has enforced since February 2024, and the order I fix things in when a good sender lands in the spam folder.SPF, DKIM & DMARC Explained
What SPF, DKIM and DMARC each actually verify, the failures I keep seeing on live mail traffic, and how to read the three of them in a report.Why Are My Emails Going to Spam?
A developer who reads mail headers for a living walks through the real reasons a message ends up in spam, from SPF and DKIM alignment to your own reputation.
Send the real email to a test address first
42 checks on SPF, DKIM, DMARC, blocklists, unsubscribe headers and content, plus the folder it lands in at Gmail, Outlook, Yahoo and other providers. Free, no signup.