diff --git a/docs/content/administration/mail-templates.en-us.md b/docs/content/administration/mail-templates.en-us.md
index 9077f97ae..0154fe55d 100644
--- a/docs/content/administration/mail-templates.en-us.md
+++ b/docs/content/administration/mail-templates.en-us.md
@@ -259,14 +259,14 @@ This template produces something along these lines:
 The template system contains several functions that can be used to further process and format
 the messages. Here's a list of some of them:
 
-| Name             | Parameters  | Available | Usage                                                                       |
-| ---------------- | ----------- | --------- |-----------------------------------------------------------------------------|
-| `AppUrl`         | -           | Any       | Gitea's URL                                                                 |
-| `AppName`        | -           | Any       | Set from `app.ini`, usually "Gitea"                                         |
-| `AppDomain`      | -           | Any       | Gitea's host name                                                           |
-| `EllipsisString` | string, int | Any       | Truncates a string to the specified length; adds ellipsis as needed         |
-| `SanitizeHTML`   | string      | Body only | Sanitizes text by removing any dangerous HTML tags from it.                 |
-| `SafeHTML`       | string      | Body only | Takes the input as HTML; can be used for `.ReviewComments.RenderedContent`. |
+| Name             | Parameters  | Available | Usage                                                               |
+| ---------------- | ----------- | --------- | ------------------------------------------------------------------- |
+| `AppUrl`         | -           | Any       | Gitea's URL                                                         |
+| `AppName`        | -           | Any       | Set from `app.ini`, usually "Gitea"                                 |
+| `AppDomain`      | -           | Any       | Gitea's host name                                                   |
+| `EllipsisString` | string, int | Any       | Truncates a string to the specified length; adds ellipsis as needed |
+| `SanitizeHTML`   | string      | Body only | Sanitizes text by removing any dangerous HTML tags from it          |
+| `SafeHTML`       | string      | Body only | Takes the input as HTML, can be used for outputing raw HTML content |
 
 These are _functions_, not metadata, so they have to be used:
 
diff --git a/docs/content/administration/mail-templates.zh-cn.md b/docs/content/administration/mail-templates.zh-cn.md
index d58f9dc17..e8c281733 100644
--- a/docs/content/administration/mail-templates.zh-cn.md
+++ b/docs/content/administration/mail-templates.zh-cn.md
@@ -242,14 +242,14 @@ _主题_ 和 _邮件正文_ 由 [Golang的模板引擎](https://go.dev/pkg/text/
 
 模板系统包含一些函数，可用于进一步处理和格式化消息。以下是其中一些函数的列表：
 
-| 函数名              | 参数        | 可用于       | 用法                                                      |
-|------------------| ----------- | ------------ |---------------------------------------------------------|
-| `AppUrl`         | -           | 任何地方     | Gitea 的 URL                                             |
-| `AppName`        | -           | 任何地方     | 从 `app.ini` 中设置，通常为 "Gitea"                             |
-| `AppDomain`      | -           | 任何地方     | Gitea 的主机名                                              |
-| `EllipsisString` | string, int | 任何地方     | 将字符串截断为指定长度；根据需要添加省略号                                   |
-| `SanitizeHTML`   | string      | 仅正文部分   | 通过删除其中的危险 HTML 标签对文本进行清理                                |
-| `SafeHTML`       | string      | 仅正文部分   | 将输入作为 HTML 处理；可用于 `.ReviewComments.RenderedContent` 等字段 |
+| 函数名              | 参数        | 可用于       | 用法                             |
+|------------------| ----------- | ------------ | ------------------------------ |
+| `AppUrl`         | -           | 任何地方     | Gitea 的 URL                    |
+| `AppName`        | -           | 任何地方     | 从 `app.ini` 中设置，通常为 "Gitea"    |
+| `AppDomain`      | -           | 任何地方     | Gitea 的主机名                     |
+| `EllipsisString` | string, int | 任何地方     | 将字符串截断为指定长度；根据需要添加省略号          |
+| `SanitizeHTML`   | string      | 仅正文部分   | 通过删除其中的危险 HTML 标签对文本进行清理       |
+| `SafeHTML`       | string      | 仅正文部分   | 将输入作为 HTML 处理；可用于输出原始的 HTML 内容 |
 
 这些都是 _函数_，而不是元数据，因此必须按以下方式使用：
 
diff --git a/modules/templates/mailer.go b/modules/templates/mailer.go
index 04032e398..f1832cba0 100644
--- a/modules/templates/mailer.go
+++ b/modules/templates/mailer.go
@@ -5,6 +5,7 @@ package templates
 
 import (
 	"context"
+	"fmt"
 	"html/template"
 	"regexp"
 	"strings"
@@ -33,7 +34,7 @@ func mailSubjectTextFuncMap() texttmpl.FuncMap {
 	}
 }
 
-func buildSubjectBodyTemplate(stpl *texttmpl.Template, btpl *template.Template, name string, content []byte) {
+func buildSubjectBodyTemplate(stpl *texttmpl.Template, btpl *template.Template, name string, content []byte) error {
 	// Split template into subject and body
 	var subjectContent []byte
 	bodyContent := content
@@ -42,20 +43,13 @@ func buildSubjectBodyTemplate(stpl *texttmpl.Template, btpl *template.Template,
 		subjectContent = content[0:loc[0]]
 		bodyContent = content[loc[1]:]
 	}
-	if _, err := stpl.New(name).
-		Parse(string(subjectContent)); err != nil {
-		log.Error("Failed to parse template [%s/subject]: %v", name, err)
-		if !setting.IsProd {
-			log.Fatal("Please fix the mail template error")
-		}
+	if _, err := stpl.New(name).Parse(string(subjectContent)); err != nil {
+		return fmt.Errorf("failed to parse template [%s/subject]: %w", name, err)
 	}
-	if _, err := btpl.New(name).
-		Parse(string(bodyContent)); err != nil {
-		log.Error("Failed to parse template [%s/body]: %v", name, err)
-		if !setting.IsProd {
-			log.Fatal("Please fix the mail template error")
-		}
+	if _, err := btpl.New(name).Parse(string(bodyContent)); err != nil {
+		return fmt.Errorf("failed to parse template [%s/body]: %w", name, err)
 	}
+	return nil
 }
 
 // Mailer provides the templates required for sending notification mails.
@@ -87,7 +81,13 @@ func Mailer(ctx context.Context) (*texttmpl.Template, *template.Template) {
 			if firstRun {
 				log.Trace("Adding mail template %s: %s by %s", tmplName, assetPath, layerName)
 			}
-			buildSubjectBodyTemplate(subjectTemplates, bodyTemplates, tmplName, content)
+			if err = buildSubjectBodyTemplate(subjectTemplates, bodyTemplates, tmplName, content); err != nil {
+				if firstRun {
+					log.Fatal("Failed to parse mail template, err: %v", err)
+				} else {
+					log.Error("Failed to parse mail template, err: %v", err)
+				}
+			}
 		}
 	}
 
diff --git a/templates/mail/issue/default.tmpl b/templates/mail/issue/default.tmpl
index 9a893e11f..796dc403b 100644
--- a/templates/mail/issue/default.tmpl
+++ b/templates/mail/issue/default.tmpl
@@ -65,7 +65,7 @@
 			{{$.locale.Tr "mail.issue.in_tree_path" .TreePath}}
 			<div class="review">
 				<pre>{{.Patch}}</pre>
-				<div>{{.RenderedContent | SafeHTML}}</div>
+				<div>{{.RenderedContent}}</div>
 			</div>
 		{{end -}}
 		{{if eq .ActionName "push"}}