diff --git a/IRaCIS.Core.Application/Service/Document/DTO/TrialEmailNoticeConfigViewModel.cs b/IRaCIS.Core.Application/Service/Document/DTO/TrialEmailNoticeConfigViewModel.cs
index cc3f110d..97b2810c 100644
--- a/IRaCIS.Core.Application/Service/Document/DTO/TrialEmailNoticeConfigViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Document/DTO/TrialEmailNoticeConfigViewModel.cs
@@ -132,7 +132,7 @@ namespace IRaCIS.Core.Application.ViewModel
         public string FromEmail { get; set; } = string.Empty;
 
 
-        public List<UserTypeEnum> ToUserTypeList { get; set; }
+        public List<UserTypeEnum>? ToUserTypeList { get; set; }
         public List<UserTypeEnum> CopyUserTypeList { get; set; }
 
 
diff --git a/IRaCIS.Core.Application/Service/Document/TrialEmailNoticeConfigService.cs b/IRaCIS.Core.Application/Service/Document/TrialEmailNoticeConfigService.cs
index 3d03f74e..6292dae0 100644
--- a/IRaCIS.Core.Application/Service/Document/TrialEmailNoticeConfigService.cs
+++ b/IRaCIS.Core.Application/Service/Document/TrialEmailNoticeConfigService.cs
@@ -71,8 +71,8 @@ namespace IRaCIS.Core.Application.Service
         {
 
             await TestEmailConfigAsync(new TrialEmailNoticeConfigAddOrEdit() { 
-            
-            AuthorizationCode=inDto.EmailAuthorizationCode,
+             
+             AuthorizationCode=inDto.EmailAuthorizationCode,
              FromEmail=inDto.EmailFromEmail,
              FileName=inDto.EmailFromName,
              SMTPServerAddress=inDto.EmailSMTPServerAddress,
@@ -913,7 +913,9 @@ namespace IRaCIS.Core.Application.Service
 
         private async Task TestEmailConfigAsync(TrialEmailNoticeConfigAddOrEdit config)
         {
-            var toUserList = await  _repository.Where<TrialUser>(t => t.TrialId == config.TrialId && config.ToUserTypeList.Contains(t.User.UserTypeEnum)).Select(t => new { t.User.EMail, t.User.FullName }).ToListAsync();
+            var toUserList = await _repository.Where<TrialUser>(t => t.TrialId == config.TrialId)
+                .WhereIf(config.ToUserTypeList != null, t => config.ToUserTypeList.Contains(t.User.UserTypeEnum))
+                .Select(t => new { t.User.EMail, t.User.FullName }).ToListAsync();
 
 
             if (!config.FromEmail.Contains("@") || string.IsNullOrEmpty(config.FromEmail))