Email forwarding script

#!/usr/local/bin python

"""
This script is used to forward email
"""

import os, sys, poplib, getopt, getpass, email, smtplib

from_email = '???'
to_email = '???'
pop3_server_url = '???'
pop3_server_port = 110
pop3_user = '???'
pop3_pass = '???'
delete_after = True
subject_filter = '????'

def match_filter(subject, sfilter):
    return subject.find(sfilter) == 0

def forward_mail(femail, temail, mail):

    for (header, value) in mail.items():
        if not header in ('Content-Type', 'Content-Transfer-Encoding', 'Subject', 'Mime-Version'):
            del mail[header]

    mail["From"] = femail
    mail["To"] = temail
    for (header, value) in mail.items():
        print "%s: %s" % (header, value)

    server = smtplib.SMTP('localhost')
    server.set_debuglevel(0)
    server.sendmail(femail, temail, mail.as_string())
    server.quit()    

def process_mail(pop3_mail):
    
    mail = email.message_from_string(pop3_mail)
    subject = mail.get("Subject")
    if match_filter(subject, subject_filter):
        print "Forward email: %s" % (subject)
        forward_mail(from_email, to_email, mail)
        return True
    else:
        print "Skip email: %s" % (subject)
        return False

if __name__ == '__main__':

    def usage():

        print "Usag:"
        print "python forward_mail.py -s <pop3_server> -p <pop3_port> -u <user> -c <credential> -f <from_email> -t <to_email>"

    try:                                
        opts, args = getopt.getopt(sys.argv[1:], "s:p:u:c:f:t:")
    except getopt.GetoptError:
        usage()
        sys.exit(2)                     

    for opt, arg in opts:
        if opt in ("-s"):
            pop3_server_url = arg
        elif opt in ("-p"):
            pop3_server_port = int(arg)
        elif opt in ("-u"):
            pop3_user = arg
        elif opt in ("-c"):
            pop3_pass = arg
        elif opt in ("-f"):
            from_email = arg
        elif opt in ("-t"):
            to_email = arg

    if pop3_user is None:
        pop3_user = getpass.getUser()
    if pop3_pass is None:
        pop3_pass = getpass.getpass()

    pop3 = poplib.POP3(pop3_server_url, pop3_server_port)
    pop3.user(pop3_user)
    pop3.pass_(pop3_pass)
    msg_count = len(pop3.list()[1])
    print "Total messages in Inbox: %d" % (msg_count)

    for i in range(msg_count):
        resp, text, octets = pop3.retr(i+1)
        if process_mail('\n'.join(text)) and delete_after:
            print "Forwarded email is deleted"
            pop3.dele(i+1)
    pop3.quit()