Mailscribe

Mailscribe is a free, no-signup suite of email marketing tools and guides. It helps email marketers plan campaigns, write better subject lines, and maintain deliverability. The suite includes an Email Verifier to reduce bounces, an SMTP Tester to check connectivity and authentication, and a Subject Line Generator for copy ideas. No account is required, and no inputs or results are stored. The site also features a blog with practical articles and a community Q&A section where email pros answer questions about deliverability, migration, and campaign strategy.