diff --git a/mailer.rst b/mailer.rst
index 9f81cedc91a..d03bbef5a33 100644
--- a/mailer.rst
+++ b/mailer.rst
@@ -174,7 +174,6 @@ Sendgrid             sendgrid+smtp://KEY@default                n/a
 
         # .env
         MAILER_DSN=mailgun+https://KEY:DOMAIN@requestbin.com
-        MAILER_DSN=mailgun+https://KEY:DOMAIN@requestbin.com:99
 
     Note that the protocol is *always* HTTPs and cannot be changed.