feat: add email verify code endpoint and require code on register

- POST /v1/user/email/code sends a 6-digit verify code via email (rate-limited, 10min TTL)
- RegisterByEmail now validates verify_code before creating the account
- Added email code cache helpers mirroring SMS pattern
- Added error codes 1007 (email code error) and 1008 (send limit)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -7,5 +7,7 @@
 texpixel
 /vendor
 
+doc_ai
+document_ai
 dev_deploy.sh
 speed_take.sh

api/router.go

@@ -43,6 +43,7 @@ func SetupRouter(engine *gin.RouterGroup) {
 		userRouter := v1.Group("/user")
 		{
 			userRouter.POST("/sms", userEndpoint.SendVerificationCode)
+			userRouter.POST("/email/code", userEndpoint.SendEmailVerifyCode)
 			userRouter.POST("/register", userEndpoint.RegisterByEmail)
 			userRouter.POST("/login", userEndpoint.LoginByEmail)
 			userRouter.GET("/oauth/google/url", userEndpoint.GetGoogleOAuthUrl)

api/v1/user/handler.go

@@ -106,6 +106,26 @@ func (h *UserEndpoint) GetUserInfo(ctx *gin.Context) {
 	}))
 }
 
+func (h *UserEndpoint) SendEmailVerifyCode(ctx *gin.Context) {
+	req := model.EmailVerifyCodeRequest{}
+	if err := ctx.ShouldBindJSON(&req); err != nil {
+		ctx.JSON(http.StatusOK, common.ErrorResponse(ctx, common.CodeParamError, common.CodeParamErrorMsg))
+		return
+	}
+
+	if err := h.userService.SendEmailVerifyCode(ctx, req.Email); err != nil {
+		if bizErr, ok := err.(*common.BusinessError); ok {
+			ctx.JSON(http.StatusOK, common.ErrorResponse(ctx, int(bizErr.Code), bizErr.Message))
+			return
+		}
+		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "发送邮件验证码失败", "error", err)
+		ctx.JSON(http.StatusOK, common.ErrorResponse(ctx, common.CodeSystemError, common.CodeSystemErrorMsg))
+		return
+	}
+
+	ctx.JSON(http.StatusOK, common.SuccessResponse(ctx, model.EmailVerifyCodeResponse{}))
+}
+
 func (h *UserEndpoint) RegisterByEmail(ctx *gin.Context) {
 	req := model.EmailRegisterRequest{}
 	if err := ctx.ShouldBindJSON(&req); err != nil {
@@ -113,7 +133,7 @@ func (h *UserEndpoint) RegisterByEmail(ctx *gin.Context) {
 		return
 	}
 
-	uid, err := h.userService.RegisterByEmail(ctx, req.Email, req.Password)
+	uid, err := h.userService.RegisterByEmail(ctx, req.Email, req.Password, req.VerifyCode)
 	if err != nil {
 		if bizErr, ok := err.(*common.BusinessError); ok {
 			ctx.JSON(http.StatusOK, common.ErrorResponse(ctx, int(bizErr.Code), bizErr.Message))

config/config.go

@@ -16,6 +16,25 @@ type Config struct {
 	Mathpix   MathpixConfig     `mapstructure:"mathpix"`
 	BaiduOCR  BaiduOCRConfig    `mapstructure:"baidu_ocr"`
 	Google    GoogleOAuthConfig `mapstructure:"google"`
+	Email     EmailConfig       `mapstructure:"email"`
+}
+
+type EmailConfig struct {
+	FromName   string           `mapstructure:"from_name"`
+	FromAddr   string           `mapstructure:"from_addr"`
+	AliyunSMTP AliyunSMTPConfig `mapstructure:"aliyun_smtp"`
+	Resend     ResendEmailConfig `mapstructure:"resend"`
+}
+
+type AliyunSMTPConfig struct {
+	Host     string `mapstructure:"host"`
+	Port     int    `mapstructure:"port"`
+	Username string `mapstructure:"username"`
+	Password string `mapstructure:"password"`
+}
+
+type ResendEmailConfig struct {
+	APIKey string `mapstructure:"api_key"`
 }
 
 type BaiduOCRConfig struct {

config/config_dev.yaml

@@ -7,14 +7,14 @@ database:
   host: localhost
   port: 3006
   username: root
-  password: texpixel#pwd123!
+  password: root123
   dbname: doc_ai
   max_idle: 10
   max_open: 100
 
 redis:
   addr: localhost:6079
-  password: yoge@123321!
+  password: redis123
   db: 0
 
 limit:
@@ -56,3 +56,14 @@ google:
   client_secret: "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"
   redirect_uri: "https://app.cloud.texpixel.com:10443/auth/google/callback"
   proxy: "http://localhost:7890"
+
+email:
+  from_name: "TexPixel Support"
+  from_addr: "support@texpixel.com"
+  aliyun_smtp:
+    host: "smtp.qiye.aliyun.com"
+    port: 465
+    username: "support@texpixel.com"
+    password: "8bPw2W9LlgHSTTfk"
+  resend:
+    api_key: "re_xxxxxxxxxxxx"

config/config_prod.yaml

@@ -56,3 +56,14 @@ google:
   client_secret: "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"
   redirect_uri: "https://texpixel.com/auth/google/callback"
   proxy: "http://100.115.184.74:7890"
+
+email:
+  from_name: "TexPixel Support"
+  from_addr: "support@texpixel.com"
+  aliyun_smtp:
+    host: "smtp.qiye.aliyun.com"
+    port: 465
+    username: "support@texpixel.com"
+    password: "8bPw2W9LlgHSTTfk"
+  resend:
+    api_key: "re_xxxxxxxxxxxx"

deploy_prod.sh

@@ -1,10 +1,68 @@
 #!/bin/bash
+set -euo pipefail
 
-docker build -t crpi-8s2ierii2xan4klg.cn-beijing.personal.cr.aliyuncs.com/texpixel/doc_ai_backend:latest . && docker push crpi-8s2ierii2xan4klg.cn-beijing.personal.cr.aliyuncs.com/texpixel/doc_ai_backend:latest
+REGISTRY="crpi-8s2ierii2xan4klg.cn-beijing.personal.cr.aliyuncs.com/texpixel/doc_ai_backend"
+BUILD_HOST="ubuntu"
+BUILD_DIR="~/Dev/doc_ai_backed"
 
-ssh ecs << 'ENDSSH'
+# --- Guard: must be on main/master ---
-docker stop doc_ai doc_ai_backend 2>/dev/null || true
+BRANCH=$(git rev-parse --abbrev-ref HEAD)
-docker rm doc_ai doc_ai_backend 2>/dev/null || true
+if [[ "${BRANCH}" != "main" && "${BRANCH}" != "master" ]]; then
-docker pull crpi-8s2ierii2xan4klg.cn-beijing.personal.cr.aliyuncs.com/texpixel/doc_ai_backend:latest
+  echo "ERROR: must be on main or master branch (current: ${BRANCH})"
-docker run -d --name doc_ai -p 8024:8024 --restart unless-stopped crpi-8s2ierii2xan4klg.cn-beijing.personal.cr.aliyuncs.com/texpixel/doc_ai_backend:latest -env=prod
+  exit 1
-ENDSSH
+fi
+
+VERSION=$(git rev-parse --short HEAD)
+IMAGE_VERSIONED="${REGISTRY}:${VERSION}"
+IMAGE_LATEST="${REGISTRY}:latest"
+
+echo "==> [1/3] Pulling latest code on Ubuntu"
+ssh ${BUILD_HOST} "
+  set -e
+  cd ${BUILD_DIR}
+  git fetch origin
+  git checkout master 2>/dev/null || git checkout main
+  git pull
+"
+
+echo "==> [2/3] Building & pushing image on Ubuntu"
+ssh ${BUILD_HOST} "
+  set -e
+  cd ${BUILD_DIR}
+  docker build --platform linux/amd64 \
+    -t ${IMAGE_VERSIONED} \
+    -t ${IMAGE_LATEST} \
+    .
+  docker push ${IMAGE_VERSIONED}
+  docker push ${IMAGE_LATEST}
+  docker rmi ${IMAGE_VERSIONED} ${IMAGE_LATEST} 2>/dev/null || true
+"
+
+echo "==> [3/3] Deploying on ECS"
+ssh ecs "
+  set -e
+  echo '--- Pulling image'
+  docker pull ${IMAGE_VERSIONED}
+
+  echo '--- Stopping old container'
+  docker stop doc_ai 2>/dev/null || true
+  docker rm   doc_ai 2>/dev/null || true
+
+  echo '--- Starting new container'
+  docker run -d \
+    --name doc_ai \
+    -p 8024:8024 \
+    --restart unless-stopped \
+    ${IMAGE_VERSIONED} \
+    -env=prod
+
+  echo '--- Removing old doc_ai images (keeping current)'
+  docker images --format '{{.Repository}}:{{.Tag}} {{.ID}}' \
+    | grep '^${REGISTRY}' \
+    | grep -v ':${VERSION}' \
+    | grep -v ':latest' \
+    | awk '{print \$2}' \
+    | xargs -r docker rmi || true
+"
+
+echo "==> Done. Running version: ${VERSION}"

internal/model/user/user.go

@@ -23,9 +23,16 @@ type UserInfoResponse struct {
 	Email    string `json:"email"`
 }
 
+type EmailVerifyCodeRequest struct {
+	Email string `json:"email" binding:"required,email"`
+}
+
+type EmailVerifyCodeResponse struct{}
+
 type EmailRegisterRequest struct {
 	Email      string `json:"email" binding:"required,email"`
 	Password   string `json:"password" binding:"required,min=6"`
+	VerifyCode string `json:"verify_code" binding:"required"`
 }
 
 type EmailRegisterResponse struct {

internal/service/task.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"net/http"
 	"strings"
+	"time"
 
 	"gitea.com/texpixel/document_ai/internal/model/task"
 	"gitea.com/texpixel/document_ai/internal/storage/dao"
@@ -187,7 +188,13 @@ func (svc *TaskService) ExportTask(ctx context.Context, req *task.ExportTaskRequ
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
-		log.Error(ctx, "func", "ExportTask", "msg", "http request failed", "status", resp.StatusCode)
+		respBody, _ := io.ReadAll(resp.Body)
+		log.Error(ctx, "func", "ExportTask", "msg", "export service returned non-200",
+			"status", resp.StatusCode,
+			"body", string(respBody),
+			"markdown_len", len(markdown),
+			"filename", filename,
+		)
 		return nil, "", fmt.Errorf("export service returned status: %d", resp.StatusCode)
 	}
 

internal/service/user_service.go

@@ -14,6 +14,7 @@ import (
 	"gitea.com/texpixel/document_ai/internal/storage/cache"
 	"gitea.com/texpixel/document_ai/internal/storage/dao"
 	"gitea.com/texpixel/document_ai/pkg/common"
+	"gitea.com/texpixel/document_ai/pkg/email"
 	"gitea.com/texpixel/document_ai/pkg/log"
 	"gitea.com/texpixel/document_ai/pkg/sms"
 	"golang.org/x/crypto/bcrypt"
@@ -115,14 +116,57 @@ func (svc *UserService) GetUserInfo(ctx context.Context, uid int64) (*dao.User,
 	return user, nil
 }
 
-func (svc *UserService) RegisterByEmail(ctx context.Context, email, password string) (uid int64, err error) {
+func (svc *UserService) SendEmailVerifyCode(ctx context.Context, emailAddr string) error {
-	existingUser, err := svc.userDao.GetByEmail(dao.DB.WithContext(ctx), email)
+	limit, err := cache.GetUserSendEmailLimit(ctx, emailAddr)
+	if err != nil {
+		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "get send email limit error", "error", err)
+		return err
+	}
+	if limit >= cache.UserSendEmailLimitCount {
+		return common.ErrEmailSendLimit
+	}
+
+	code := fmt.Sprintf("%06d", rand.Intn(1000000))
+
+	subject := "Your verification code"
+	body := fmt.Sprintf("Your verification code is: %s\nIt will expire in 10 minutes.", code)
+	if err := email.Send(ctx, emailAddr, subject, body); err != nil {
+		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "send email error", "error", err)
+		return err
+	}
+
+	if cacheErr := cache.SetUserEmailCode(ctx, emailAddr, code); cacheErr != nil {
+		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "set email code error", "error", cacheErr)
+	}
+	if cacheErr := cache.SetUserSendEmailLimit(ctx, emailAddr); cacheErr != nil {
+		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "set send email limit error", "error", cacheErr)
+	}
+	return nil
+}
+
+func (svc *UserService) RegisterByEmail(ctx context.Context, emailAddr, password, verifyCode string) (uid int64, err error) {
+	storedCode, err := cache.GetUserEmailCode(ctx, emailAddr)
+	if err != nil {
+		log.Error(ctx, "func", "RegisterByEmail", "msg", "get email code error", "error", err)
+		return 0, err
+	}
+	if storedCode == "" || storedCode != verifyCode {
+		return 0, common.ErrEmailCodeError
+	}
+
+	_ = cache.DeleteUserEmailCode(ctx, emailAddr)
+
+	return svc.registerByEmailInternal(ctx, emailAddr, password)
+}
+
+func (svc *UserService) registerByEmailInternal(ctx context.Context, emailAddr, password string) (uid int64, err error) {
+	existingUser, err := svc.userDao.GetByEmail(dao.DB.WithContext(ctx), emailAddr)
 	if err != nil {
 		log.Error(ctx, "func", "RegisterByEmail", "msg", "get user by email error", "error", err)
 		return 0, err
 	}
 	if existingUser != nil {
-		log.Warn(ctx, "func", "RegisterByEmail", "msg", "email already registered", "email", email)
+		log.Warn(ctx, "func", "RegisterByEmail", "msg", "email already registered", "email", emailAddr)
 		return 0, common.ErrEmailExists
 	}
 
@@ -133,7 +177,7 @@ func (svc *UserService) RegisterByEmail(ctx context.Context, email, password str
 	}
 
 	user := &dao.User{
-		Email:    email,
+		Email:    emailAddr,
 		Password: string(hashedPassword),
 	}
 	err = svc.userDao.Create(dao.DB.WithContext(ctx), user)

internal/storage/cache/user.go

@@ -61,3 +61,55 @@ func SetUserSendSmsLimit(ctx context.Context, phone string) error {
 func DeleteUserSmsCode(ctx context.Context, phone string) error {
 	return RedisClient.Del(ctx, fmt.Sprintf(UserSmsCodePrefix, phone)).Err()
 }
+
+const (
+	UserEmailCodeTTL         = 10 * time.Minute
+	UserSendEmailLimitTTL    = 24 * time.Hour
+	UserSendEmailLimitCount  = 5
+)
+
+const (
+	UserEmailCodePrefix = "user:email_code:%s"
+	UserSendEmailLimit  = "user:send_email_limit:%s"
+)
+
+func GetUserEmailCode(ctx context.Context, email string) (string, error) {
+	code, err := RedisClient.Get(ctx, fmt.Sprintf(UserEmailCodePrefix, email)).Result()
+	if err != nil {
+		if err == redis.Nil {
+			return "", nil
+		}
+		return "", err
+	}
+	return code, nil
+}
+
+func SetUserEmailCode(ctx context.Context, email, code string) error {
+	return RedisClient.Set(ctx, fmt.Sprintf(UserEmailCodePrefix, email), code, UserEmailCodeTTL).Err()
+}
+
+func GetUserSendEmailLimit(ctx context.Context, email string) (int, error) {
+	limit, err := RedisClient.Get(ctx, fmt.Sprintf(UserSendEmailLimit, email)).Result()
+	if err != nil {
+		if err == redis.Nil {
+			return 0, nil
+		}
+		return 0, err
+	}
+	return strconv.Atoi(limit)
+}
+
+func SetUserSendEmailLimit(ctx context.Context, email string) error {
+	count, err := RedisClient.Incr(ctx, fmt.Sprintf(UserSendEmailLimit, email)).Result()
+	if err != nil {
+		return err
+	}
+	if count > UserSendEmailLimitCount {
+		return errors.New("send email limit")
+	}
+	return RedisClient.Expire(ctx, fmt.Sprintf(UserSendEmailLimit, email), UserSendEmailLimitTTL).Err()
+}
+
+func DeleteUserEmailCode(ctx context.Context, email string) error {
+	return RedisClient.Del(ctx, fmt.Sprintf(UserEmailCodePrefix, email)).Err()
+}

main.go

@@ -16,6 +16,7 @@ import (
 	"gitea.com/texpixel/document_ai/internal/storage/dao"
 	"gitea.com/texpixel/document_ai/pkg/common"
 	"gitea.com/texpixel/document_ai/pkg/cors"
+	"gitea.com/texpixel/document_ai/pkg/email"
 	"gitea.com/texpixel/document_ai/pkg/log"
 	"gitea.com/texpixel/document_ai/pkg/middleware"
 	"gitea.com/texpixel/document_ai/pkg/sms"
@@ -44,6 +45,7 @@ func main() {
 	dao.InitDB(config.GlobalConfig.Database)
 	cache.InitRedisClient(config.GlobalConfig.Redis)
 	sms.InitSmsClient()
+	email.InitEmailClient()
 
 	// 设置gin模式
 	gin.SetMode(config.GlobalConfig.Server.Mode)

pkg/common/errors.go

@@ -18,6 +18,8 @@ const (
 	CodeEmailExists      = 1004
 	CodeEmailNotFound    = 1005
 	CodePasswordMismatch = 1006
+	CodeEmailCodeError   = 1007
+	CodeEmailSendLimit   = 1008
 )
 
 const (
@@ -36,6 +38,8 @@ const (
 	CodeEmailExistsMsg      = "email already registered"
 	CodeEmailNotFoundMsg    = "email not found"
 	CodePasswordMismatchMsg = "password mismatch"
+	CodeEmailCodeErrorMsg   = "email verify code error"
+	CodeEmailSendLimitMsg   = "email send limit reached"
 )
 
 type BusinessError struct {
@@ -61,4 +65,6 @@ var (
 	ErrEmailExists      = NewError(CodeEmailExists, CodeEmailExistsMsg, nil)
 	ErrEmailNotFound    = NewError(CodeEmailNotFound, CodeEmailNotFoundMsg, nil)
 	ErrPasswordMismatch = NewError(CodePasswordMismatch, CodePasswordMismatchMsg, nil)
+	ErrEmailCodeError   = NewError(CodeEmailCodeError, CodeEmailCodeErrorMsg, nil)
+	ErrEmailSendLimit   = NewError(CodeEmailSendLimit, CodeEmailSendLimitMsg, nil)
 )

pkg/email/email.go

@@ -0,0 +1,160 @@
+package email
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/mail"
+	"net/smtp"
+	"regexp"
+	"strings"
+	"sync"
+
+	"gitea.com/texpixel/document_ai/config"
+	"gitea.com/texpixel/document_ai/pkg/log"
+)
+
+var (
+	once   sync.Once
+	client *Client
+)
+
+// chineseDomainRe matches email domains that should be routed via Aliyun SMTP.
+var chineseDomainRe = regexp.MustCompile(`(?i)(\.edu\.cn|qq\.com|163\.com|126\.com|sina\.com|sohu\.com)$`)
+
+type Client struct {
+	cfg config.EmailConfig
+}
+
+func InitEmailClient() *Client {
+	once.Do(func() {
+		client = &Client{cfg: config.GlobalConfig.Email}
+	})
+	return client
+}
+
+// Send routes the email to the appropriate provider based on the recipient domain.
+func Send(ctx context.Context, to, subject, body string) error {
+	if client == nil {
+		return fmt.Errorf("email client not initialized, call InitEmailClient first")
+	}
+	return client.Send(ctx, to, subject, body)
+}
+
+func (c *Client) Send(ctx context.Context, to, subject, body string) error {
+	if _, err := mail.ParseAddress(to); err != nil {
+		return fmt.Errorf("invalid email address %q: %w", to, err)
+	}
+
+	domain := to[strings.LastIndex(to, "@")+1:]
+	if chineseDomainRe.MatchString(domain) {
+		return c.sendViaAliyunSMTP(ctx, to, subject, body)
+	}
+	return c.sendViaResend(ctx, to, subject, body)
+}
+
+func (c *Client) sendViaAliyunSMTP(ctx context.Context, to, subject, body string) error {
+	cfg := c.cfg.AliyunSMTP
+	addr := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port)
+
+	tlsConfig := &tls.Config{ServerName: cfg.Host}
+	conn, err := tls.Dial("tcp", addr, tlsConfig)
+	if err != nil {
+		log.Error(ctx, "func", "sendViaAliyunSMTP", "msg", "tls dial failed", "error", err)
+		return err
+	}
+
+	smtpClient, err := smtp.NewClient(conn, cfg.Host)
+	if err != nil {
+		conn.Close()
+		log.Error(ctx, "func", "sendViaAliyunSMTP", "msg", "smtp new client failed", "error", err)
+		return err
+	}
+	defer smtpClient.Close()
+
+	auth := smtp.PlainAuth("", cfg.Username, cfg.Password, cfg.Host)
+	if err = smtpClient.Auth(auth); err != nil {
+		log.Error(ctx, "func", "sendViaAliyunSMTP", "msg", "smtp auth failed", "error", err)
+		return err
+	}
+
+	from := c.cfg.FromAddr
+	if err = smtpClient.Mail(from); err != nil {
+		return err
+	}
+	if err = smtpClient.Rcpt(to); err != nil {
+		return err
+	}
+
+	wc, err := smtpClient.Data()
+	if err != nil {
+		return err
+	}
+	defer wc.Close()
+
+	if _, err = wc.Write([]byte(buildMessage(c.cfg.FromName, from, to, subject, body))); err != nil {
+		return err
+	}
+
+	log.Info(ctx, "func", "sendViaAliyunSMTP", "msg", "email sent via aliyun smtp", "to", to)
+	return nil
+}
+
+type resendRequest struct {
+	From    string   `json:"from"`
+	To      []string `json:"to"`
+	Subject string   `json:"subject"`
+	Html    string   `json:"html"`
+}
+
+func (c *Client) sendViaResend(ctx context.Context, to, subject, body string) error {
+	payload := resendRequest{
+		From:    fmt.Sprintf("%s <%s>", c.cfg.FromName, c.cfg.FromAddr),
+		To:      []string{to},
+		Subject: subject,
+		Html:    body,
+	}
+	jsonData, err := json.Marshal(payload)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, "https://api.resend.com/emails", bytes.NewReader(jsonData))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+c.cfg.Resend.APIKey)
+
+	resp, err := (&http.Client{}).Do(req)
+	if err != nil {
+		log.Error(ctx, "func", "sendViaResend", "msg", "http request failed", "error", err)
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
+		respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+		log.Error(ctx, "func", "sendViaResend", "msg", "resend api returned non-2xx", "status", resp.StatusCode, "to", to, "body", string(respBody))
+		return fmt.Errorf("resend api returned status %d: %s", resp.StatusCode, string(respBody))
+	}
+
+	log.Info(ctx, "func", "sendViaResend", "msg", "email sent via resend", "to", to)
+	return nil
+}
+
+func buildMessage(fromName, fromAddr, to, subject, body string) string {
+	var buf bytes.Buffer
+	buf.WriteString(fmt.Sprintf("From: %s <%s>\r\n", fromName, fromAddr))
+	buf.WriteString(fmt.Sprintf("To: %s\r\n", to))
+	buf.WriteString(fmt.Sprintf("Subject: %s\r\n", subject))
+	buf.WriteString("MIME-Version: 1.0\r\n")
+	buf.WriteString("Content-Type: text/html; charset=UTF-8\r\n")
+	buf.WriteString("\r\n")
+	buf.WriteString(body)
+	return buf.String()
+}