diff --git a/docs/content/doc/usage/email-setup.en-us.md b/docs/content/doc/usage/email-setup.en-us.md
index 6fc9de81dd..bf5ac4601f 100644
--- a/docs/content/doc/usage/email-setup.en-us.md
+++ b/docs/content/doc/usage/email-setup.en-us.md
@@ -15,19 +15,33 @@ menu:
 
 # Email setup
 
-- To use Gitea's built-in Email support, update the `app.ini` config file [mailer] section:
+To use Gitea's built-in Email support, update the `app.ini` config file [mailer] section:
 
+## Sendmail version 
+Use the operating system’s sendmail command instead of SMTP. This is common on Linux servers.  
+Note: For use in the official Gitea Docker image, please configure with the SMTP version.
 ```ini
 [mailer]
-ENABLED = true
-HOST    = mail.mydomain.com:587
-FROM    = gitea@mydomain.com
-USER    = gitea@mydomain.com
-PASSWD  = `password`
+ENABLED       = true
+FROM          = gitea@mydomain.com
+MAILER_TYPE   = sendmail
+SENDMAIL_PATH = /usr/sbin/sendmail
+```
+
+## SMTP version
+```ini
+[mailer]
+ENABLED        = true
+FROM           = gitea@mydomain.com
+MAILER_TYPE    = smtp
+HOST           = mail.mydomain.com:587
+IS_TLS_ENABLED = true
+USER           = gitea@mydomain.com
+PASSWD         = `password`
 ```
 
 - Restart Gitea for the configuration changes to take effect.
 
 - To send a test email to validate the settings, go to Gitea > Site Administration > Configuration > SMTP Mailer Configuration.
 
-For the full list of options check the [Config Cheat Sheet]({{< relref "doc/advanced/config-cheat-sheet.en-us.md" >}})
\ No newline at end of file
+For the full list of options check the [Config Cheat Sheet]({{< relref "doc/advanced/config-cheat-sheet.en-us.md" >}})