
Unlimited free email spam & deliverability testing

SendBridge Mail Tester is a free, unlimited email deliverability and spam score checker. Send a test email to a unique auto-generated address and get a detailed 0–100 score in seconds - no signup required.
What we check (12 areas):
How it works: (1) We generate a unique test inbox, (2) you send an email from your real sending setup (SMTP, Mailchimp, SendGrid, SES, Gmail, etc.), (3) you get a shareable report with actionable fixes.
Built for email marketers validating campaigns, developers debugging transactional email, and agencies/consultants producing shareable audit reports with embeddable score badges.
A modern free alternative to mail-tester.com - with unlimited tests, Rspamd analysis, and a mobile-friendly UI.
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