IMAP email Parser and Extractor

import imaplib
import imaplib_connect
from imaplib_list_parse import parse_list_response
import pprint
import email
import re

c = imaplib_connect.open_connection()
try:
    c.select('INBOX.Nedorucene', readonly=True)
    msg_ids = c.search(None, '(SUBJECT "delivery")')
    print msg_ids
except:
    pass


my_list=[]
for cislo in str(msg_ids).split():
    if cislo.isdigit():
        cislo_int = int(cislo)
        my_list.append(cislo_int)

unreg_mails = []

for msg_id in my_list:
    try:
        c.select('INBOX.Nedorucene', readonly=True)
        typ, msg_data = c.fetch(msg_id, '(BODY.PEEK[TEXT])')
        for response_part in msg_data:
            if isinstance(response_part, tuple):
                mbody = response_part[1]
                mextract = re.findall(r'[\w\.-]+@[\w\.-]+', mbody )
                print "\n", mextract
                for email in mextract:
                    print "Duplicate" if email in unreg_mails else unreg_mails.append(email)
    except:
        pass

unreg_mails.sort()
print "\n", "\n", unreg_mails

print "\n", len(unreg_mails)

c.logout()
to_write = str(unreg_mails).replace("[","").replace("]","").replace("'","").replace(",","\n").replace(" ","")
file = open('unregistered.txt','w')
file.write(str(to_write))