SMTP VRFY Checker

There are a couple of these out there already, but for whatever reason they seem to crap out or provide incorrect results. I took a quick thirty seconds and wrote another one that seems to be more accurate the the others i played with.

root@bt:~ # cat smtp-vrfy-check.py
#!/usr/bin/env python
# simple smtp VRFY checker.. that works!
# by brad a.

import socket
import getopt
import sys
import re


def usage():
        help = "Options:\n"
        help += "\t-h <host>\t host\n"
        help += "\t-p <port>\t port (Default: 25)\n"
        help += "\t-u <filename>\t userlist\n"
        help += "\t-v \t verbose\n"
        return help


def main():
        print "SMTP VRFY Checker"
        print "By brad a."
        print "---------------------------------"

        try:
                opts, args = getopt.getopt(sys.argv[1:], "h:p:u:v",[])

        except getopt.GetoptError:
                print usage()
                return
        port = 25
        verbose = host = userlist = 0

        for o, a in opts:
                if o == "-h":
                        host = a
                if o == "-p":
                        port = int(a)
                if o == "-u":
                        userlist = a
                if o == "-v":
                        verbose = 1
        if (host == 0) or (userlist == 0):
                print usage()
                return

        print "[+] Establishing connection to",host,":",port
        s = socket.socket()
        s.settimeout(10)
        recv_data = 0
        s.connect((host,port))

        banner = s.recv(512)
        if verbose == 1:
                print "[V] Banner:"
                print banner

        file = open(userlist,'r')
        count = 1
        for line in file:

                if count % 10 == 0:
                        if verbose == 1:
                                print "[V] Attempted ten usernames, reconnecting"
                        s.shutdown(2)
                        s.close

                        s = socket.socket()
                        s.settimeout(10)
                        recv_data = 0
                        s.connect((host,port))

                        banner = s.recv(512)
                        if verbose == 1:
                                print "[V] Banner:"
                                print banner

                user = line.rstrip('\n')

                msg = "VRFY "
                msg += user
                msg += "\n"
                if verbose == 1:
                        print "[V] Sending:",msg

                error = s.sendall(msg)

                if error:
                        print "\n[!] Error with user",user,":", error
                else:
                        try:
                                recv_data = s.recv(512)
                        except socket.timeout:
                                print "[!] Timeout on user",user,"!"

                if recv_data:
#                       print recv_data
                        if re.match("250",recv_data):
                                print "[+] Found User:",user
                        if verbose == 1:
                                print "[+] User:",user,
                                if re.match("550",recv_data):
                                        print " -> Not Found!"
                                else:
                                        print " -> Unknown Error!"
                                print recv_data
                else:
                        print "\nNo recv_data!"
                count+=1

        file.close()
        s.shutdown(2)
        s.close()

main()