fix: email panic

common/email.go

@@ -9,12 +9,20 @@ import (
 	"time"
 )
 
-func generateMessageID() string {
+func generateMessageID() (string, error) {
+	split := strings.Split(SMTPAccount, "@")
+	if len(split) < 2 {
+		return "", fmt.Errorf("invalid SMTP account")
+	}
 	domain := strings.Split(SMTPAccount, "@")[1]
-	return fmt.Sprintf("<%d.%s@%s>", time.Now().UnixNano(), GetRandomString(12), domain)
+	return fmt.Sprintf("<%d.%s@%s>", time.Now().UnixNano(), GetRandomString(12), domain), nil
 }
 
 func SendEmail(subject string, receiver string, content string) error {
+	id, err2 := generateMessageID()
+	if err2 != nil {
+		return err2
+	}
 	if SMTPFrom == "" { // for compatibility
 		SMTPFrom = SMTPAccount
 	}
@@ -28,7 +36,7 @@ func SendEmail(subject string, receiver string, content string) error {
 		"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), generateMessageID(), content))
+		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, ";")