MailKit.Net.Smtp.SmtpClient.FlushCommandQueue C# (CSharp) Method

		void FlushCommandQueue (MimeMessage message, MailboxAddress sender, IList<MailboxAddress> recipients, CancellationToken cancellationToken)
		{
			if (queued.Count == 0)
				return;

			try {
				var responses = new List<SmtpResponse> ();
				Exception rex = null;
				int count = 0;
				int rcpt = 0;

				// Note: queued commands are buffered by the stream
				Stream.Flush (cancellationToken);

				// Note: we need to read all responses from the server before we can process
				// them in case any of them have any errors so that we can RSET the state.
				try {
					for (int i = 0; i < queued.Count; i++)
						responses.Add (Stream.ReadResponse (cancellationToken));
				} catch (Exception ex) {
					// Note: save this exception for later (it may be related to
					// an error response for a MAIL FROM or RCPT TO command).
					rex = ex;
				}

				for (int i = 0; i < responses.Count; i++) {
					switch (queued[i]) {
					case SmtpCommand.MailFrom:
						ProcessMailFromResponse (message, sender, responses[i]);
						break;
					case SmtpCommand.RcptTo:
						if (ProcessRcptToResponse (message, recipients[rcpt++], responses[i]))
							count++;
						break;
					}
				}

				if (count == 0)
					OnNoRecipientsAccepted (message);

				if (rex != null)
					throw new SmtpProtocolException ("Error reading a response from the SMTP server.", rex);
			} finally {
				queued.Clear ();
			}
		}