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Subject: Re: Tryign to send mail via a python script by using the local MTA
From: William Ray Wing <wrw@mac.com>
In-reply-to: <l1aibt$ha7$1@dont-email.me>
Date: Tue, 17 Sep 2013 18:34:50 -0400
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To: Ferrous Cranus <nikos.gr33k@gmail.com>
Cc: python-list@python.org, William Ray Wing <wrw@mac.com>
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On Sep 17, 2013, at 5:42 PM, Ferrous Cranus <nikos.gr33k@gmail.com> =
wrote:

> On 17/9/2013 7:30 =CE=BC=CE=BC, Denis McMahon wrote:
>> On Tue, 17 Sep 2013 18:17:43 +0300, Ferrous Cranus wrote:
>>=20
>>> So cant this be done in python or not?
>>> or is a mtetr of configuring the MTA? conf file?
>>=20
>> Python can not control data that is added to the message after it has
>> left the python program. If you want to retain maximum possible =
control
>> of the mail process from within python, you need to use a python =
module
>> that handles the smtp exchange with the destination mta, however even
>> then you can not control the content of header lines added by that
>> destination mta, which will invariably include the real[1] ip address =
of
>> your system.
>>=20
>> [1] The ip address that it is sending ack packets to as part of the =
smtp
>> session, so unless you're using a proxy somewhere, this will be your
>> system's ip address. Can't fake it. If the other system doesn't know =
your
>> ip address, it can't send acks, and the tcp session fails.
>>=20
> Ah, now we are getting somewhere.
>=20
> So the foreign MTA tests for real time connectivity with the local MTA =
and it tries to detect a working host and ip address.
>=20
> So even if we alter the hostname and the ip address of our localhost =
then the smtp procedure will fail correct?
> --=20
> https://mail.python.org/mailman/listinfo/python-list

I think you need to read up on some of the most basic fundamentals of =
tcp/ip networking, i.e., the basis of the global internet.  EVERY =
network packet (and I do mean every) packet in an IP network carries =
both a source and a destination address in its header.  These are =
fundamentally necessary in order to allow the gateway router at the =
originating site to direct an outgoing packet to its destination, and =
allow the receiving host at the destination site to craft reply packets.

-Bill=