diff --git a/README.md b/README.md
index 295666f..04fd373 100644
--- a/README.md
+++ b/README.md
@@ -165,3 +165,4 @@ Can't send or receive mail? Getting marked as spam? There are tools to double-ch
 - [Test your TXT records via mail](https://appmaildev.com/en/dkim)
 - [Is your IP blacklisted?](https://mxtoolbox.com/blacklists.aspx)
 - [mxtoolbox](https://mxtoolbox.com/SuperTool.aspx)
+- [Did it land in spam?](https://email-spam-tester.com/)