diff --git a/administration/email-setup.en-us.md b/administration/email-setup.en-us.md
index 2f92e204..10058d82 100644
--- a/administration/email-setup.en-us.md
+++ b/administration/email-setup.en-us.md
@@ -31,7 +31,7 @@ Note: For Internet-facing sites consult documentation of your MTA for instructio
 [mailer]
 ENABLED       = true
 FROM          = gitea@mydomain.com
-MAILER_TYPE   = sendmail
+PROTOCOL      = sendmail
 SENDMAIL_PATH = /usr/sbin/sendmail
 SENDMAIL_ARGS = "--" ; most "sendmail" programs take options, "--" will prevent an email address being interpreted as an option.
 ```
@@ -44,10 +44,9 @@ Directly use SMTP server as relay. This option is useful if you don't want to se
 [mailer]
 ENABLED        = true
 FROM           = gitea@mydomain.com
-MAILER_TYPE    = smtp
+PROTOCOL       = smtps
 SMTP_ADDR      = mail.mydomain.com
 SMTP_PORT      = 587
-IS_TLS_ENABLED = true
 USER           = gitea@mydomain.com
 PASSWD         = `password`
 ```
@@ -80,7 +79,7 @@ SMTP_PORT      = 465
 FROM           = example.user@gmail.com
 USER           = example.user
 PASSWD         = `***`
-MAILER_TYPE    = smtp
+PROTOCOL       = smtp
 IS_TLS_ENABLED = true
 ```
 
diff --git a/administration/email-setup.zh-cn.md b/administration/email-setup.zh-cn.md
index e526a9d4..0a7ac337 100644
--- a/administration/email-setup.zh-cn.md
+++ b/administration/email-setup.zh-cn.md
@@ -31,7 +31,7 @@ Gitea 具有邮件功能，用于发送事务性邮件（例如注册确认邮
 [mailer]
 ENABLED       = true
 FROM          = gitea@mydomain.com
-MAILER_TYPE   = sendmail
+PROTOCOL   = sendmail
 SENDMAIL_PATH = /usr/sbin/sendmail
 SENDMAIL_ARGS = "--" ; 大多数 "sendmail" 程序都接受选项，使用 "--" 将防止电子邮件地址被解释为选项。
 ```
@@ -44,10 +44,9 @@ SENDMAIL_ARGS = "--" ; 大多数 "sendmail" 程序都接受选项，使用 "--"
 [mailer]
 ENABLED        = true
 FROM           = gitea@mydomain.com
-MAILER_TYPE    = smtp
+PROTOCOL    = smtps
 SMTP_ADDR      = mail.mydomain.com
 SMTP_PORT      = 587
-IS_TLS_ENABLED = true
 USER           = gitea@mydomain.com
 PASSWD         = `password`
 ```
@@ -80,8 +79,7 @@ SMTP_PORT      = 465
 FROM           = example.user@gmail.com
 USER           = example.user
 PASSWD         = `***`
-MAILER_TYPE    = smtp
-IS_TLS_ENABLED = true
+PROTOCOL    = smtps
 ```
 
 请注意，您需要创建并使用一个 [应用密码](https://support.google.com/accounts/answer/185833?hl=en) 并在您的 Google 帐户上启用 2FA。您将无法直接使用您的 Google 帐户密码。
diff --git a/installation/with-docker-rootless.en-us.md b/installation/with-docker-rootless.en-us.md
index 3c81c863..fc99819d 100644
--- a/installation/with-docker-rootless.en-us.md
+++ b/installation/with-docker-rootless.en-us.md
@@ -306,7 +306,7 @@ services:
     environment:
       - GITEA__mailer__ENABLED=true
       - GITEA__mailer__FROM=${GITEA__mailer__FROM:?GITEA__mailer__FROM not set}
-      - GITEA__mailer__MAILER_TYPE=smtp
+      - GITEA__mailer__PROTOCOL=smtp
       - GITEA__mailer__HOST=${GITEA__mailer__HOST:?GITEA__mailer__HOST not set}
       - GITEA__mailer__IS_TLS_ENABLED=true
       - GITEA__mailer__USER=${GITEA__mailer__USER:-apikey}
diff --git a/installation/with-docker-rootless.zh-cn.md b/installation/with-docker-rootless.zh-cn.md
index 1910e0a8..9d5013ea 100644
--- a/installation/with-docker-rootless.zh-cn.md
+++ b/installation/with-docker-rootless.zh-cn.md
@@ -274,7 +274,7 @@ services:
     environment:
       - GITEA__mailer__ENABLED=true
       - GITEA__mailer__FROM=${GITEA__mailer__FROM:?GITEA__mailer__FROM not set}
-      - GITEA__mailer__MAILER_TYPE=smtp
+      - GITEA__mailer__PROTOCOL=smtp
       - GITEA__mailer__HOST=${GITEA__mailer__HOST:?GITEA__mailer__HOST not set}
       - GITEA__mailer__IS_TLS_ENABLED=true
       - GITEA__mailer__USER=${GITEA__mailer__USER:-apikey}
diff --git a/installation/with-docker.en-us.md b/installation/with-docker.en-us.md
index 7b470460..f5a09e9f 100644
--- a/installation/with-docker.en-us.md
+++ b/installation/with-docker.en-us.md
@@ -303,9 +303,8 @@ services:
     environment:
       - GITEA__mailer__ENABLED=true
       - GITEA__mailer__FROM=${GITEA__mailer__FROM:?GITEA__mailer__FROM not set}
-      - GITEA__mailer__MAILER_TYPE=smtp
+      - GITEA__mailer__PROTOCOL=smtps
       - GITEA__mailer__HOST=${GITEA__mailer__HOST:?GITEA__mailer__HOST not set}
-      - GITEA__mailer__IS_TLS_ENABLED=true
       - GITEA__mailer__USER=${GITEA__mailer__USER:-apikey}
       - GITEA__mailer__PASSWD="""${GITEA__mailer__PASSWD:?GITEA__mailer__PASSWD not set}"""
 ```
diff --git a/installation/with-docker.zh-cn.md b/installation/with-docker.zh-cn.md
index e04d3158..d8cbc2f9 100644
--- a/installation/with-docker.zh-cn.md
+++ b/installation/with-docker.zh-cn.md
@@ -287,9 +287,8 @@ services:
     environment:
       - GITEA__mailer__ENABLED=true
       - GITEA__mailer__FROM=${GITEA__mailer__FROM:?GITEA__mailer__FROM not set}
-      - GITEA__mailer__MAILER_TYPE=smtp
+      - GITEA__mailer__PROTOCOL=smtps
       - GITEA__mailer__HOST=${GITEA__mailer__HOST:?GITEA__mailer__HOST not set}
-      - GITEA__mailer__IS_TLS_ENABLED=true
       - GITEA__mailer__USER=${GITEA__mailer__USER:-apikey}
       - GITEA__mailer__PASSWD="""${GITEA__mailer__PASSWD:?GITEA__mailer__PASSWD not set}"""
 ```