Email deliverability is the difference between your email landing in the inbox and the spam folder. If your email doesn't land in the inbox, it's worthless. But how do you know where your email is landing? You need a deliverability tool.
Here are the 7 best email deliverability tools in 2026, compared. Each one checks different things, and each one is good for a different use case.
Check all six records on your domain in about 30 seconds. No signup, no credit card. Get a spam-risk score and the exact record to fix.
Run My Free TestInboxProof is a free deliverability test that checks SPF, DKIM, DMARC, TLS, PTR, and IP reputation on your domain. It gives you a spam-risk score and tells you exactly which record to fix. No signup required. The Pro plan adds continuous monitoring, DMARC report aggregation, and multi-domain support.
Best for: Agencies and developers who need a quick, free deliverability test with no signup.
GlockApps is a paid deliverability platform that checks SPF, DKIM, DMARC, TLS, and IP reputation. It also offers inbox placement testing, which sends test emails to major providers (Gmail, Outlook, Yahoo) and reports where they land. The free tier is limited to a single test per day.
Best for: Teams that need inbox placement testing and are willing to pay for it.
Mail Tester is a free tool that checks your email content for spam triggers. You paste your HTML email and it gives you a score out of 10. It checks things like image-to-text ratio, link density, and spam trigger words. It doesn't check your DNS records, so it's a content test, not a domain test.
Best for: Marketers who want to check their email content for spam triggers.
MXToolbox is a free tool that checks your MX records, SPF, DKIM, DMARC, and IP reputation. It's a good first step if you want to see if your DNS records are configured correctly. It doesn't give you a spam-risk score, and it doesn't tell you which record to fix.
Best for: Quick DNS record checks.
PowerPost is a paid deliverability platform that checks SPF, DKIM, DMARC, TLS, and IP reputation. It also offers inbox placement testing and email authentication monitoring. The free tier is limited to a single domain.
Best for: Teams that need continuous monitoring and inbox placement testing.
Litmus is a paid email testing platform that checks your email across different email clients and devices. It also offers deliverability testing, but it's more focused on email rendering than on DNS configuration. It's a good tool if you need to test how your email looks in different clients.
Best for: Teams that need to test email rendering across clients and devices.
SendGrid is an email sending platform that includes deliverability monitoring. It checks your SPF, DKIM, and DMARC records, and gives you a deliverability score. It's a good option if you're already using SendGrid to send your email.
Best for: Teams that are already using SendGrid to send their email.
If you need a quick, free deliverability test with no signup, use InboxProof. It checks all six records on your domain in about 30 seconds, and it tells you exactly which record to fix.
If you need inbox placement testing, use GlockApps or PowerPost. They send test emails to major providers and report where they land.
If you need to check your email content for spam triggers, use Mail Tester. It checks your HTML email and gives you a score out of 10.
If you need a quick DNS record check, use MXToolbox. It's free and it checks your MX, SPF, DKIM, DMARC, and IP reputation.
Run a free deliverability test on your domain in about 30 seconds. Get a spam-risk score and the exact record to fix. No signup required.
Run My Free Test