正则表达式-邮箱的判断

import re

def emaills(e):
    if (len(e) >= 5):
        if re.match("[a-zA-Z0-9]+@[a-zA-Z0-9]+.+[a-zA-Z]",e):
            return 'correct'
    return 'error'

e = raw_input('please emaill:')
print e
a = emaills(e)
print a