изменения чтобы работало

SushiBar/SushiBar/App.config

@@ -2,10 +2,10 @@
 <configuration>
 	<appSettings>
 		<add key="SmtpClientHost" value="smtp.yandex.ru" />
-		<add key="SmtpClientPort" value="465" />
+		<add key="SmtpClientPort" value="587" />
 		<add key="PopHost" value="pop.yandex.com" />
 		<add key="PopPort" value="995" />
-		<add key="MailLogin" value="tester.b.moio@ya.ru" />
+		<add key="MailLogin" value="tester.b.moio@yandex.ru" />
 		<add key="MailPassword" value="pyzzqswchjevecec" />
 	</appSettings>
 </configuration>

SushiBar/SushiBarBusinessLogic/BusinessLogics/OrderLogic.cs

@@ -156,18 +156,26 @@ namespace SushiBarBusinessLogic.BusinessLogics
         }
         private bool SendOrderStatusMail(int clientId, string subject, string text)
         {
-            var client = _clientLogic.ReadElement(new() { Id = clientId });
-            if (client == null)
+            try
+            {
+                var client = _clientLogic.ReadElement(new() { Id = clientId });
+                if (client == null)
+                {
+                    return false;
+                }
+                _mailWorker.MailSendAsync(new()
+                {
+                    MailAddress = client.Email,
+                    Subject = subject,
+                    Text = text
+                });
+                return true;
+            }
+            catch (Exception ex)
             {
                 return false;
             }
-            _mailWorker.MailSendAsync(new()
-            {
-                MailAddress = client.Email,
-                Subject = subject,
-                Text = text
-            });
-            return true;
+            
         }
     }
 }

SushiBar/SushiBarRestApi/appsettings.json

@@ -9,12 +9,12 @@
 
   "MailConfigBindingModel": {
     "SmtpClientHost": "smtp.yandex.ru",
-    "SmtpClientPort": 465,
+    "SmtpClientPort": 587,
 
     "PopHost": "pop.yandex.com",
     "PopPort": 995,
 
-    "MailLogin": "tester.b.moio@ya.ru",
+    "MailLogin": "tester.b.moio@yandex.ru",
     "MailPassword": "pyzzqswchjevecec"
   }
 }