diff --git a/README.md b/README.md
index a3a6c3eb..00d5a5ae 100644
--- a/README.md
+++ b/README.md
@@ -362,7 +362,7 @@ Table of Contents
 
   * [mailinator.com](https://www.mailinator.com/) — Free, public, email system where you can use any inbox you want
   * [cloudmersive.com](https://www.cloudmersive.com/email-verification-api) — Email validation and verification API for developers, 10,000 free API requests/month
-  * [sparkpost.com](https://www.sparkpost.com/) — First 15,000 emails/month free
+  * [sparkpost.com](https://www.sparkpost.com/) — First 500 emails/month free
   * [mailgun.com](https://www.mailgun.com/) — First 10,000 emails/month free
   * [tinyletter.com](https://tinyletter.com/) — 5,000 subscribers/month free
   * [mailchimp.com](https://mailchimp.com/) — 2,000 subscribers and 12,000 emails/month free