Every tool you need to
master your emails.
A complete, professional suite to validate email addresses, analyze subject lines, inspect DNS records, and format campaign data. Totally free.
Powerful, simple, free.
Choose a tool below to get started instantly.
Email Validator
Verify email existence, format, and MX records before hitting send to reduce bounces.
Use Tool →Subject Line Tester
Analyze subject lines based on open-rate predictions and check for spam-trigger words.
Use Tool →DNS Lookup
Perform deep DNS queries to fetch A, MX, TXT, and CNAME records instantly.
Use Tool →UTM Builder
Generate properly formatted UTM tracking URLs for perfect Google Analytics tracking.
Use Tool →Data Parser
Quickly count characters, words, and analyze text structure for optimized content.
Use Tool →More Coming Soon
We are constantly adding new tools to help marketers succeed.
Stay TunedWhy use Mailster Tools?
Mailster provides a completely free, highly reliable set of utilities designed for digital marketers, webmasters, and developers. By optimizing your email campaigns, validating addresses in real-time, and structuring your tracking URLs perfectly, you can increase your open rates and avoid spam filters.
Our infrastructure is built for speed and privacy. We do not store your lookup data or email lists. All processing is done efficiently to ensure you get the results you need without waiting. Whether you're checking DNS records or running a quick subject line test, Mailster is your go-to productivity suite.