Mail-Address Check

#!/usr/bin/python
 
# Copyright (c) 2015 by Peter_Siegrist(SystemLoesungen)  (PSS @ ZweierNet.ch)
# pss.ZweierNet.ch
#
# All Rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
 
from socket import *
import sys
import string
 
if len(sys.argv) < 4:
	print 'usage: ', sys.argv[0], '   '
	sys.exit(False)
 
server = sys.argv[1]
port = int(sys.argv[2])
mail_to_check = sys.argv[3]
 
sSocket = socket(AF_INET, SOCK_STREAM)
sSocket.connect((server, port))
recv = sSocket.recv(1024)
#print recv
 
sSocket.send('HELO xy\r\n')
recv2 = sSocket.recv(1024)
#print recv2
 
sSocket.send('RSET\r\n')
recv1 = sSocket.recv(1024)
#print recv1
 
sSocket.send('MAIL FROM: addrecheck@example.org\r\n')
recv3 = sSocket.recv(1024)
#print recv3
 
sSocket.send('RCPT TO: ' + mail_to_check + '\r\n')
recv4 = sSocket.recv(1024)
#print recv4
 
recv5 = recv4.replace("\n", "").replace("\r", "")
if recv5[-2:] == 'ok' or recv5[-2:] == 'OK':
	sys.exit(True)
sys.exit(False)