Enumerate Users via SMTP

#!/usr/bin/python
import socket
import sys

if len(sys.argv) != 2:
    print "Usage: vrfy.py <username>"
    sys.exit(0)
# Create a Socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Connect to the Server
connect = s.connect(('10.11.1.217',25))

# Receive the banner
banner = s.recv(1024)

print banner

# VRFY a user
s.send('VRFY ' + sys.argv[1] + '\r\n')
result = s.recv(1024)

print result

# Close the socket
s.close()