Reading 'received' headers: Email Headers Parsing

[dont bother]

Hi,
I am a new bie experimenting with python.
I have this piece of code to parse the received
headers from emails. However, when I run with a file
as an argument it skips lines like: 1, 3, 5 etc...
I see why is this so : Its because of the 
msg=mbox.next()
But I dont know how to fix this: I mean I dont know
how I can stay at the current one and then when I am
done with the current one I shall go to
msg=mbox.next()

Any hints?

Thanks
Dont











import mailbox
import string
import email
import email.Utils
import time
import sys
import re

#open passed mailbox filename
fp=open(sys.argv[1], 'r')

#open mailbox from file
mbox=mailbox.PortableUnixMailbox(fp)

#getcurrent time
nowtime=time.time()

#iterate over mail messages

while 1:
#get next message

        msg=mbox.next()


#exit if we have looked at the last one

        if msg == None:
                break

#get received header
        received =msg.get('received')
        print received
#skup messages with no received header
        if received == None:
                continue



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