From cc749a3dce81d1cc43616b0b69d1dfc61b5c5273 Mon Sep 17 00:00:00 2001
From: smail <likb_blue@163.com>
Date: Sun, 27 Sep 2026 00:01:00 +0800
Subject: [PATCH] =?UTF-8?q?=E6=98=8E=E7=A1=AE=E6=98=BE=E7=A4=BA=E7=B3=BB?=
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---
 backend/services/logstore/mail.go        | 4 ++++
 backend/utils/send/send.go               | 2 +-
 backend/utils/validation/notification.go | 7 ++++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/backend/services/logstore/mail.go b/backend/services/logstore/mail.go
index b41680b..29654cf 100644
--- a/backend/services/logstore/mail.go
+++ b/backend/services/logstore/mail.go
@@ -9,6 +9,8 @@ import (
 	"net/textproto"
 	"strconv"
 	"time"
+
+	"git.pcux.cn/xuans/Smail/utils/validation"
 )
 
 type MailDetails struct {
@@ -25,6 +27,8 @@ func MailFailureReason(err error) string {
 	var protocol *textproto.Error
 	var network net.Error
 	switch {
+	case errors.Is(err, validation.ErrNotificationRecipient):
+		return "系统通知地址仅用于发信，不接受收信，请改用普通邮箱地址"
 	case errors.As(err, &certificate):
 		return "对端证书验证失败"
 	case errors.As(err, &dns):
diff --git a/backend/utils/send/send.go b/backend/utils/send/send.go
index 40de08b..84699bb 100644
--- a/backend/utils/send/send.go
+++ b/backend/utils/send/send.go
@@ -136,7 +136,7 @@ func parseRecipientAddress(user *parsemail.User) (string, string, error) {
 	}
 	address := strings.TrimSpace(user.EmailAddress)
 	if validation.IsNotificationAddress(address, config.CurrentMailDomains().Accepted) {
-		return address, "", errors.New("notification address does not accept mail")
+		return address, "", validation.ErrNotificationRecipient
 	}
 	if address == "" || address != user.EmailAddress {
 		return address, "", errors.New("recipient address is empty or contains surrounding whitespace")
diff --git a/backend/utils/validation/notification.go b/backend/utils/validation/notification.go
index 16e68b8..34e40a5 100644
--- a/backend/utils/validation/notification.go
+++ b/backend/utils/validation/notification.go
@@ -1,6 +1,11 @@
 package validation
 
-import "strings"
+import (
+	"errors"
+	"strings"
+)
+
+var ErrNotificationRecipient = errors.New("notification address does not accept mail")
 
 // 加号不属于可注册账号字符，保留地址不会占用普通用户的邮箱。
 const NotificationLocalPart = "notification+system"