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🤖 Generated with [Claude Code](https://claude.ai/code)

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

common/email.go

@@ -0,0 +1,90 @@
+package common
+
+import (
+	"crypto/tls"
+	"encoding/base64"
+	"fmt"
+	"net/smtp"
+	"slices"
+	"strings"
+	"time"
+)
+
+func generateMessageID() (string, error) {
+	split := strings.Split(SMTPFrom, "@")
+	if len(split) < 2 {
+		return "", fmt.Errorf("invalid SMTP account")
+	}
+	domain := strings.Split(SMTPFrom, "@")[1]
+	return fmt.Sprintf("<%d.%s@%s>", time.Now().UnixNano(), GetRandomString(12), domain), nil
+}
+
+func SendEmail(subject string, receiver string, content string) error {
+	if SMTPFrom == "" { // for compatibility
+		SMTPFrom = SMTPAccount
+	}
+	id, err2 := generateMessageID()
+	if err2 != nil {
+		return err2
+	}
+	if SMTPServer == "" && SMTPAccount == "" {
+		return fmt.Errorf("SMTP 服务器未配置")
+	}
+	encodedSubject := fmt.Sprintf("=?UTF-8?B?%s?=", base64.StdEncoding.EncodeToString([]byte(subject)))
+	mail := []byte(fmt.Sprintf("To: %s\r\n"+
+		"From: %s<%s>\r\n"+
+		"Subject: %s\r\n"+
+		"Date: %s\r\n"+
+		"Message-ID: %s\r\n"+ // 添加 Message-ID 头
+		"Content-Type: text/html; charset=UTF-8\r\n\r\n%s\r\n",
+		receiver, SystemName, SMTPFrom, encodedSubject, time.Now().Format(time.RFC1123Z), id, content))
+	auth := smtp.PlainAuth("", SMTPAccount, SMTPToken, SMTPServer)
+	addr := fmt.Sprintf("%s:%d", SMTPServer, SMTPPort)
+	to := strings.Split(receiver, ";")
+	var err error
+	if SMTPPort == 465 || SMTPSSLEnabled {
+		tlsConfig := &tls.Config{
+			InsecureSkipVerify: true,
+			ServerName:         SMTPServer,
+		}
+		conn, err := tls.Dial("tcp", fmt.Sprintf("%s:%d", SMTPServer, SMTPPort), tlsConfig)
+		if err != nil {
+			return err
+		}
+		client, err := smtp.NewClient(conn, SMTPServer)
+		if err != nil {
+			return err
+		}
+		defer client.Close()
+		if err = client.Auth(auth); err != nil {
+			return err
+		}
+		if err = client.Mail(SMTPFrom); err != nil {
+			return err
+		}
+		receiverEmails := strings.Split(receiver, ";")
+		for _, receiver := range receiverEmails {
+			if err = client.Rcpt(receiver); err != nil {
+				return err
+			}
+		}
+		w, err := client.Data()
+		if err != nil {
+			return err
+		}
+		_, err = w.Write(mail)
+		if err != nil {
+			return err
+		}
+		err = w.Close()
+		if err != nil {
+			return err
+		}
+	} else if isOutlookServer(SMTPAccount) || slices.Contains(EmailLoginAuthServerList, SMTPServer) {
+		auth = LoginAuth(SMTPAccount, SMTPToken)
+		err = smtp.SendMail(addr, auth, SMTPFrom, to, mail)
+	} else {
+		err = smtp.SendMail(addr, auth, SMTPFrom, to, mail)
+	}
+	return err
+}