How does Mail Tester work?

Mail Tester analyzes your input and provides detailed results based on email deliverability & authentication best practices. Simply enter your data and get instant results.

Is Mail Tester free to use?

Yes, Mail Tester is 100% free with no signup required. Use it as many times as you need without creating an account.

How accurate are the results?

Our tester provides real-time analysis based on current data and industry standards. Results are updated regularly to ensure accuracy.

100% Free • No SignupEmail Deliverability & Authenticationtester

Mail Tester

Name: Mail Tester
Author: FirstSales

Test email deliverability by sending to a temporary inbox and analyzing spam score, headers, and rendering. Works instantly without signup.

Instant Results

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Please generate a test email address to continue.

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Key Features

Temporary email generation

Real-time email receiving

Spam score analysis

Header inspection

SPF/DKIM/DMARC validation

HTML rendering preview

Use Cases

Email deliverability testing

Spam filter diagnosis

Email authentication verification

Content rendering check

Header analysis

Tool Info

Typetester

Free

Yes

Signup

Not Required

DKIM Record CheckerVerify your DKIM DNS record is correctly published and properly signing outgoing emails

DMARC Record CheckerAnalyze your DMARC policy to ensure email authentication alignment and reporting is active

Email Authentication AnalyzerRun a full SPF + DKIM + DMARC audit on any domain and get a pass/fail scorecard

Inbox Placement TesterTest whether your emails land in inbox, spam, or promotions tab across Gmail, Outlook, and Yahoo

SMTP Server TesterTest SMTP connectivity by sending a test message and verifying handshake, TLS, and authentication

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Automated cold email sequences

Smart deliverability tools

Built-in analytics

About Mail Tester

The Mail Tester generates unique temporary email addresses for testing email deliverability. Send emails to the generated address and see what arrives-including headers, spam score, authentication results, and content rendering issues.

Automate Your Email Deliverability & Authentication

This free tool is great for quick checks. FirstSales automates your entire email deliverability & authentication workflow with AI-powered personalization and 87% inbox placement.

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Setup in 8 minutes • Cancel anytime

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General

Deliverability