Simple SMTP tester script

smtptest.py

import smtplib
import argparse
import sys

parser = argparse.ArgumentParser(description='SMTP Tester', add_help=True)
parser.add_argument('-s', '--server', dest='server', action='store',
    help='Server Name or IP')
parser.add_argument('-u', '--username', dest='username', action='store',
    help='username - try with and without the @')
parser.add_argument('-p', '--password', dest='password', action='store',
    help='password')
parser.add_argument('-f', '--from', dest='sender', action='store',
    help='sender', default='smtptester@example.com')
parser.add_argument('-t', '--to', dest='to', action='store',
    help='to', default='support@example.com')
parser.add_argument('--port', dest='port', action='store',
    help='port (default=25)', default=25, type=int)
parser.add_argument('-v', dest='verbose', action='store_true', default=True)
args = parser.parse_args()

if not (args.server and args.username and args.password):
    parser.print_help()
    sys.exit(2)

server = smtplib.SMTP(args.server)
server.set_debuglevel(args.verbose)
server.ehlo()
server.login(args.username, args.password)
header = 'To: %s\nFrom: %s\nSubject: Testing SMTP\n' % (args.sender, args.to)
print header
msg = header + '\n this is a test msg, please reply to [%s] \n\n' % args.sender
server.sendmail(args.sender, args.to, msg)
print 'message sent!'
server.close()