diff --git a/README.md b/README.md
index 4897d7b2..4a8b028a 100644
--- a/README.md
+++ b/README.md
@@ -881,6 +881,7 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
   * [Postmark](https://postmarkapp.com/) - 100 emails/month free, unlimited DMARC weekly digests.
   * [Proton Mail](https://proton.me/mail) -  Free secure email account service provider with built-in end-to-end encryption. Free 1GB storage.
   * [Resend](https://resend.com) - Transactional emails API for developers. 3,000 emails/month, 100 emails/day free, one custom domain.
+  * [SendBridge Mail Tester](https://sendbridge.com/mail-tester) — Free email deliverability test with no signup. Generates a unique inbox address, then analyzes SPF, DKIM, DMARC, Rspamd spam score, 23+ RBL blacklists, reverse DNS, and content quality. Unlimited tests, results in seconds, shareable report pages.
   * [Sender](https://www.sender.net) - Up to 15,000 emails/month, up to 2,500 subscribers
   * [Sendpulse](https://sendpulse.com) - 500 subscribers/month, 15,000 emails/month free
   * [SendStreak](https://www.sendstreak.com/) - Email framework as a service, that adds templates, automations, history, etc to your own SMTP server (E.g. AWS, Maileroo, Gmail). Free up to 100 emails/day, no time limit.