viral queue email normalization

utils.py

def normalize_email(email):
    '''
    Reduces an email address to its canonical form:
        - strips white space
        - transforms to lowercase
        - removes the +tag part in the name
        - removes dots if a google domain
    '''
    email = email.strip().lower()
    name, domain = email.rsplit('@', 1)
    try:
        name, _ = name.rsplit('+', 1)
    except ValueError:
        pass

    if domain in ['googlemail.com', 'gmail.com', 'google.com']:
        name = name.replace('.', '')

    return name + '@' + domain