diff --git a/modules/setting-management/src/Volo.Abp.SettingManagement.Application.Contracts/Volo/Abp/SettingManagement/UpdateEmailSettingsDto.cs b/modules/setting-management/src/Volo.Abp.SettingManagement.Application.Contracts/Volo/Abp/SettingManagement/UpdateEmailSettingsDto.cs
index bef0557cd4..2c122d3baf 100644
--- a/modules/setting-management/src/Volo.Abp.SettingManagement.Application.Contracts/Volo/Abp/SettingManagement/UpdateEmailSettingsDto.cs
+++ b/modules/setting-management/src/Volo.Abp.SettingManagement.Application.Contracts/Volo/Abp/SettingManagement/UpdateEmailSettingsDto.cs
@@ -11,26 +11,26 @@ namespace Volo.Abp.SettingManagement
         [Range(1, 65535)]
         public int SmtpPort { get; set; }
 
-        [MaxLength(128)]
+        [MaxLength(1024)]
         public string SmtpUserName { get; set; }
 
-        [MaxLength(64)]
+        [MaxLength(1024)]
         [DataType(DataType.Password)]
         [DisableAuditing]
         public string SmtpPassword { get; set; }
 
-        [MaxLength(256)]
+        [MaxLength(1024)]
         public string SmtpDomain { get; set; }
 
         public bool SmtpEnableSsl { get; set; }
 
         public bool SmtpUseDefaultCredentials { get; set; }
 
-        [MaxLength(256)]
+        [MaxLength(1024)]
         [Required]
         public string DefaultFromAddress { get; set; }
 
-        [MaxLength(64)]
+        [MaxLength(1024)]
         [Required]
         public string DefaultFromDisplayName { get; set; }
     }