Fix missing session created on failure (cosullivan#239)

Author: tinohager

Src/SmtpServer/SmtpSessionManager.cs

@@ -35,12 +35,12 @@ async Task RunAsync(SmtpSessionHandle handle, CancellationToken cancellationToke
 
             try
             {
+                _smtpServer.OnSessionCreated(new SessionEventArgs(handle.SessionContext));
+
                 await UpgradeAsync(handle, linkedTokenSource.Token);
 
                 linkedTokenSource.Token.ThrowIfCancellationRequested();
 
-                _smtpServer.OnSessionCreated(new SessionEventArgs(handle.SessionContext));
-
                 await handle.Session.RunAsync(linkedTokenSource.Token);
 
                 _smtpServer.OnSessionCompleted(new SessionEventArgs(handle.SessionContext));