SmtpServer.Protocol.SmtpCommandFactory.TryMakeMail C# (CSharp) Method

        public bool TryMakeMail(TokenEnumerator enumerator, out SmtpCommand command, out SmtpResponse errorResponse)
        {
            Debug.Assert(enumerator.Peek() == new Token(TokenKind.Text, "MAIL"));

            command = null;
            errorResponse = null;

            enumerator.Take();
            enumerator.TakeWhile(TokenKind.Space);

            if (enumerator.Take() != new Token(TokenKind.Text, "FROM") || enumerator.Take() != new Token(TokenKind.Punctuation, ":"))
            {
                errorResponse = new SmtpResponse(SmtpReplyCode.SyntaxError, "missing the FROM:");
                return false;
            }

            // according to the spec, whitespace isnt allowed here but most servers send it
            enumerator.TakeWhile(TokenKind.Space);

            IMailbox mailbox;
            if (_parser.TryMakeReversePath(enumerator, out mailbox) == false)
            {
                _logger.LogVerbose("Syntax Error (Text={0})", enumerator.AsText());

                errorResponse = new SmtpResponse(SmtpReplyCode.SyntaxError);
                return false;
            }

            // match the optional (ESMTP) parameters
            IDictionary<string, string> parameters;
            if (_parser.TryMakeMailParameters(enumerator, out parameters) == false)
            {
                parameters = new Dictionary<string, string>();
            }

            command = new MailCommand(mailbox, parameters, _options.MailboxFilterFactory);
            return true;
        }