1. easy_install python-emailahoy
2. pip install python-emailahoy
3. git clone http://github.com/un33k/python-emailahoy
    a. cd python-emailahoy
    b. run python setup.py
4. wget https://github.com/un33k/python-emailahoy/zipball/master
    a. unzip the downloaded file
    b. cd into python-emailahoy-* directory
    c. run python setup.py

from emailahoy import VerifyEmail
e = VerifyEmail()
status = e.verify_email_smtp(
    email='test@example.com',
    from_host='mydomain.com',
    from_email='verify@mydomain.com'
)

if e.was_found(status):
    print >> sys.stderr, "Found:", status
elif e.not_found(status):
    print >> sys.stderr, "Not Found:", status
else:
    print >> sys.stderr, "Unverifiable:", status

if verify_email_address('test@example.com'):
    print >> sys.stderr, "Found"
else:
    print >> sys.stderr, "Don't care"

1. Not all email servers will return the correct status
2. Checking an invalid email address returns within 1 second
3. Checking a valid email address returns within 4 seconds or more