MailNinja Subject Checker Email Verification Tool

Improve your open rates by checking your email subject line through 11 proven tests.

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What is MailNinja Subject Checker Email Verification Tool?

A free email subject line checker as one of the smart tools offered by MailNinja. This tool helps users write high-performing subject lines by providing features such as word and character count recommendations, avoiding spam words, using action verbs, incorporating listicles, choosing proper capitalization, using positive sentiment, writing from the reader's perspective, utilizing adverbs, asking questions, and using emojis effectively. The email subject line checker aims to help users create subject lines that stand out and increase open rates.


  • Email verification tool in private release mode.
  • Features a spreadsheet editor to organize contacts.
  • Allows users to send targeted email campaigns.
  • Provides comparative insights to analyze campaign results.
  • Emphasizes protecting subscriber's privacy.


  • Smart tools to organize contacts and send targeted email campaigns.
  • Instant comparative insights to compare results and improve email performance.
  • Protection of subscriber's privacy with secure email verification process.


  • Limited information provided about the email verification tool.
  • No specific features or benefits highlighted.
  • No indication of how the tool compares to other similar tools in the market.
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