def METHOD_NAME(self, line: str) -> Optional[PostfixLogLine]:
    """Parse a single postfix logline
    Lines consist of date, host and process info, optional queue id followed by information on the logged event
    Lines should look like:
    ```
    Jan 1 01:02:03 mail postfix/something[1234566]: ABCDEF1234: field=value
    ```
    Args:
        line (str): The log line to be parsed
    Returns:
        Optional[PostfixLogLine]: If the logline was parsed successfullt, a PostfixLogLine namedtuple is returned. If it could not be parsed, None is returned
    """
    match = re.match(self.LINE_RE, line)
    if not match:
        return
    line_data = match.groupdict()
    # We only care for postfix lines
    if "postfix" not in line_data["process"]:
        return None
    data = self._parse_fields(line_data["fields"].split(","), self.relevant_fields)
    return PostfixLogLine(line_data["timestamp"], line_data["queue_id"], data)