Test Your Email Deliverability
Struggling with low open rates? Your emails might be landing in spam. Test your domain in seconds to check your sender reputation, blacklist status, and authentication setup. Get a health score and actionable fixes to start reaching the inbox.
Free, instant, no signup required.
Stop landing in spam. Start reaching the inbox.
Mailmark fixes your deliverability on autopilot. Automated domain authentication, 28-day inbox warming, blacklist monitoring, and full campaign infrastructure -- all powered by AWS SES at a fraction of what other tools charge.
Get Started FreeFrequently Asked Questions
Why are my emails going to spam?
The most common reasons are missing authentication records (SPF, DKIM, DMARC), a poor sender reputation, being listed on email blacklists, or sending to unengaged contacts. Our free test checks all of these instantly so you know exactly what to fix.
What is an email deliverability test?
An email deliverability test checks whether your domain is properly configured to send emails that reach the inbox instead of spam. It verifies your sender authentication, checks if you're on any blacklists, and gives you a health score so you can see where you stand.
How do I improve my email open rates?
Start by fixing your domain authentication. Missing SPF, DKIM, or DMARC records are the #1 reason emails get filtered to spam. After that, warm up your domain gradually, clean your contact list, and avoid spam trigger words in your subject lines.
What do SPF, DKIM, and DMARC actually do?
They prove to email providers that you are who you say you are. SPF lists which servers can send on your behalf. DKIM adds a cryptographic signature to verify your emails weren't tampered with. DMARC tells providers what to do if those checks fail. Together, they are the foundation of inbox placement.
How often should I test my email deliverability?
Test after any DNS changes, before launching a new campaign, and at least once a month as a routine check. Blacklist status and DNS records can change without warning, so regular testing helps you catch problems before they tank your open rates.
Is this tool really free?
Yes, completely free with no signup required. Run as many checks as you need. If you want automated monitoring, inbox warming, and full campaign infrastructure, Mailmark handles all of that.