<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_valid(email):
 """Email address validation method. :param email: Email address to be saved. :type email: basestring :returns: True if email address is correct, False otherwise. :rtype: bool """

        if isinstance(email, basestring) and EMAIL_RE.match(email):
            return True
        return False