diff --git a/web/service/inbound.go b/web/service/inbound.go
index 822a4e8d8a..1450dd5738 100644
--- a/web/service/inbound.go
+++ b/web/service/inbound.go
@@ -2,9 +2,7 @@ package service
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
-	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -101,8 +99,9 @@ func (s *InboundService) getAllEmails() ([]string, error) {
 }
 
 func (s *InboundService) contains(slice []string, str string) bool {
+	lowerStr := strings.ToLower(str)
 	for _, s := range slice {
-		if s == str {
+		if strings.ToLower(s) == lowerStr {
 			return true
 		}
 	}
@@ -414,12 +413,6 @@ func (s *InboundService) AddInboundClient(data *model.Inbound) (bool, error) {
 		return false, err
 	}
 
-	email := clients[0].Email
-	valid, err := validateEmail(email)
-	if !valid {
-		return false, err
-	}
-
 	var settings map[string]interface{}
 	err = json.Unmarshal([]byte(data.Settings), &settings)
 	if err != nil {
@@ -610,12 +603,6 @@ func (s *InboundService) UpdateInboundClient(data *model.Inbound, clientId strin
 		return false, err
 	}
 
-	email := clients[0].Email
-	valid, err := validateEmail(email)
-	if !valid {
-		return false, err
-	}
-
 	var settings map[string]interface{}
 	err = json.Unmarshal([]byte(data.Settings), &settings)
 	if err != nil {
@@ -2022,26 +2009,3 @@ func (s *InboundService) MigrateDB() {
 func (s *InboundService) GetOnlineClients() []string {
 	return p.GetOnlineClients()
 }
-
-func validateEmail(email string) (bool, error) {
-
-	if strings.Contains(email, " ") {
-		return false, errors.New("email contains spaces, please remove them")
-	}
-
-	if email != strings.ToLower(email) {
-		return false, errors.New("email contains uppercase letters, please convert to lowercase")
-	}
-
-	nonEnglishPattern := `[^\x00-\x7F]`
-	if regexp.MustCompile(nonEnglishPattern).MatchString(email) {
-		return false, errors.New("email contains non-English characters, please use only English")
-	}
-
-	emailPattern := `^[a-z0-9@._-]+$`
-	if !regexp.MustCompile(emailPattern).MatchString(email) {
-		return false, errors.New("email contains invalid characters, please use only lowercase letters, digits, and @._-")
-	}
-
-	return true, nil
-}