diff --git a/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/mail/MailTemplateApi.java b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/mail/MailTemplateApi.java
new file mode 100644
index 0000000..8b148a6
--- /dev/null
+++ b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/mail/MailTemplateApi.java
@@ -0,0 +1,23 @@
+package org.agt.module.system.api.mail;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import org.agt.framework.common.pojo.CommonResult;
+import org.agt.module.system.api.mail.dto.MailTemplateSaveReqDTO;
+import org.agt.module.system.enums.ApiConstants;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+
+@FeignClient(name = ApiConstants.NAME) // TODO 芋艿：fallbackFactory =
+@Tag(name = "RPC 服务 - 邮件")
+public interface MailTemplateApi {
+
+    String PREFIX = ApiConstants.PREFIX + "/mail/template";
+
+    @PostMapping(PREFIX + "/update-template")
+    @Operation(summary = "更新单条邮件模板", description = "在 mail 为空时，使用 userId 加载对应 Admin 的邮箱")
+    CommonResult<Boolean> updateMailTemplate(@Valid @RequestBody MailTemplateSaveReqDTO reqDTO);
+
+}
diff --git a/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/mail/dto/MailTemplateSaveReqDTO.java b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/mail/dto/MailTemplateSaveReqDTO.java
new file mode 100644
index 0000000..57bf935
--- /dev/null
+++ b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/mail/dto/MailTemplateSaveReqDTO.java
@@ -0,0 +1,46 @@
+package org.agt.module.system.api.mail.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
+
+@Schema(description = "管理后台 - 邮件模版创建/修改 Request DTO")
+@Data
+public class MailTemplateSaveReqDTO {
+
+    @Schema(description = "编号", example = "1024")
+    private Long id;
+
+    @Schema(description = "模版名称", requiredMode = Schema.RequiredMode.REQUIRED, example = "测试名字")
+    @NotNull(message = "名称不能为空")
+    private String name;
+
+    @Schema(description = "模版编号", requiredMode = Schema.RequiredMode.REQUIRED, example = "test")
+    @NotNull(message = "模版编号不能为空")
+    private String code;
+
+    @Schema(description = "发送的邮箱账号编号", requiredMode = Schema.RequiredMode.REQUIRED, example = "1")
+    @NotNull(message = "发送的邮箱账号编号不能为空")
+    private Long accountId;
+
+    @Schema(description = "发送人名称", example = "芋头")
+    private String nickname;
+
+    @Schema(description = "标题", requiredMode = Schema.RequiredMode.REQUIRED, example = "注册成功")
+    @NotEmpty(message = "标题不能为空")
+    private String title;
+
+    @Schema(description = "内容", requiredMode = Schema.RequiredMode.REQUIRED, example = "你好，注册成功啦")
+    @NotEmpty(message = "内容不能为空")
+    private String content;
+
+    @Schema(description = "状态，参见 CommonStatusEnum 枚举", requiredMode = Schema.RequiredMode.REQUIRED, example = "1")
+    @NotNull(message = "状态不能为空")
+    private Integer status;
+
+    @Schema(description = "备注", example = "奥特曼")
+    private String remark;
+
+}
diff --git a/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/notify/NotifyTemplateApi.java b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/notify/NotifyTemplateApi.java
new file mode 100644
index 0000000..5fb914d
--- /dev/null
+++ b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/notify/NotifyTemplateApi.java
@@ -0,0 +1,22 @@
+package org.agt.module.system.api.notify;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import org.agt.framework.common.pojo.CommonResult;
+import org.agt.module.system.api.notify.dto.NotifyTemplateSaveReqDTO;
+import org.agt.module.system.enums.ApiConstants;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+
+@FeignClient(name = ApiConstants.NAME) // TODO 芋艿：fallbackFactory =
+@Tag(name = "RPC 服务 - 站内信")
+public interface NotifyTemplateApi {
+
+    String PREFIX = ApiConstants.PREFIX + "/notify/template";
+
+    @PostMapping(PREFIX + "/update-template")
+    @Operation(summary = "更新单条站内信模板")
+    CommonResult<Boolean> updateNotifyTemplate(@Valid @RequestBody NotifyTemplateSaveReqDTO reqDTO);
+}
diff --git a/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/notify/dto/NotifyTemplateSaveReqDTO.java b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/notify/dto/NotifyTemplateSaveReqDTO.java
new file mode 100644
index 0000000..3bb640a
--- /dev/null
+++ b/agt-module-system/agt-module-system-api/src/main/java/org/agt/module/system/api/notify/dto/NotifyTemplateSaveReqDTO.java
@@ -0,0 +1,46 @@
+package org.agt.module.system.api.notify.dto;
+
+import org.agt.framework.common.enums.CommonStatusEnum;
+import org.agt.framework.common.validation.InEnum;
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
+
+@Schema(description = "管理后台 - 站内信模版创建/修改 Request DTO")
+@Data
+public class NotifyTemplateSaveReqDTO {
+
+    @Schema(description = "ID", example = "1024")
+    private Long id;
+
+    @Schema(description = "模版名称", requiredMode = Schema.RequiredMode.REQUIRED, example = "测试模版")
+    @NotEmpty(message = "模版名称不能为空")
+    private String name;
+
+    @Schema(description = "模版编码", requiredMode = Schema.RequiredMode.REQUIRED, example = "SEND_TEST")
+    @NotNull(message = "模版编码不能为空")
+    private String code;
+
+    @Schema(description = "模版类型，对应 system_notify_template_type 字典", requiredMode = Schema.RequiredMode.REQUIRED, example = "1")
+    @NotNull(message = "模版类型不能为空")
+    private Integer type;
+
+    @Schema(description = "发送人名称", requiredMode = Schema.RequiredMode.REQUIRED, example = "土豆")
+    @NotEmpty(message = "发送人名称不能为空")
+    private String nickname;
+
+    @Schema(description = "模版内容", requiredMode = Schema.RequiredMode.REQUIRED, example = "我是模版内容")
+    @NotEmpty(message = "模版内容不能为空")
+    private String content;
+
+    @Schema(description = "状态，参见 CommonStatusEnum 枚举", requiredMode = Schema.RequiredMode.REQUIRED, example = "1")
+    @NotNull(message = "状态不能为空")
+    @InEnum(value = CommonStatusEnum.class, message = "状态必须是 {value}")
+    private Integer status;
+
+    @Schema(description = "备注", example = "我是备注")
+    private String remark;
+
+}
diff --git a/agt-module-system/agt-module-system-server/src/main/java/org/agt/module/system/api/mail/MailTemplateApiImpl.java b/agt-module-system/agt-module-system-server/src/main/java/org/agt/module/system/api/mail/MailTemplateApiImpl.java
new file mode 100644
index 0000000..ea8c823
--- /dev/null
+++ b/agt-module-system/agt-module-system-server/src/main/java/org/agt/module/system/api/mail/MailTemplateApiImpl.java
@@ -0,0 +1,28 @@
+package org.agt.module.system.api.mail;
+
+import jakarta.annotation.Resource;
+import org.agt.framework.common.pojo.CommonResult;
+import org.agt.framework.common.util.object.BeanUtils;
+import org.agt.module.system.api.mail.dto.MailTemplateSaveReqDTO;
+import org.agt.module.system.controller.admin.mail.vo.template.MailTemplateSaveReqVO;
+import org.agt.module.system.service.mail.MailTemplateService;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.RestController;
+
+import static org.agt.framework.common.pojo.CommonResult.success;
+
+@RestController // 提供 RESTful API 接口，给 Feign 调用
+@Validated
+public class MailTemplateApiImpl implements MailTemplateApi {
+
+    @Resource
+    private MailTemplateService mailTemplateService;
+
+    @Override
+    public CommonResult<Boolean> updateMailTemplate(MailTemplateSaveReqDTO reqDTO) {
+        MailTemplateSaveReqVO reqVO = BeanUtils.toBean(reqDTO, MailTemplateSaveReqVO.class);
+        mailTemplateService.updateMailTemplate(reqVO);
+        return success(true);
+    }
+
+}
diff --git a/agt-module-system/agt-module-system-server/src/main/java/org/agt/module/system/api/notify/NotifyTemplateApiImpl.java b/agt-module-system/agt-module-system-server/src/main/java/org/agt/module/system/api/notify/NotifyTemplateApiImpl.java
new file mode 100644
index 0000000..564e6c6
--- /dev/null
+++ b/agt-module-system/agt-module-system-server/src/main/java/org/agt/module/system/api/notify/NotifyTemplateApiImpl.java
@@ -0,0 +1,27 @@
+package org.agt.module.system.api.notify;
+
+import jakarta.annotation.Resource;
+import org.agt.framework.common.pojo.CommonResult;
+import org.agt.framework.common.util.object.BeanUtils;
+import org.agt.module.system.api.notify.dto.NotifyTemplateSaveReqDTO;
+import org.agt.module.system.controller.admin.notify.vo.template.NotifyTemplateSaveReqVO;
+import org.agt.module.system.service.notify.NotifyTemplateService;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.RestController;
+
+import static org.agt.framework.common.pojo.CommonResult.success;
+
+@RestController // 提供 RESTful API 接口，给 Feign 调用
+@Validated
+public class NotifyTemplateApiImpl implements NotifyTemplateApi {
+
+    @Resource
+    private NotifyTemplateService notifyTemplateService;
+
+    @Override
+    public CommonResult<Boolean> updateNotifyTemplate(NotifyTemplateSaveReqDTO reqDTO) {
+        notifyTemplateService.updateNotifyTemplate(BeanUtils.toBean(reqDTO, NotifyTemplateSaveReqVO.class));
+        return success(true);
+    }
+
+}