import smtplib
connection = smtplib.SMTP()
connection.connect("mx1.nic.fr")
connection.ehlo()
print "Using the verify method:"
status, info = connection.verify('echo@nic.fr')
print status, info
print "Manual way:"
connection.putcmd('vrfy echo@nic.fr')
status, info = connection.getreply()
print status, info