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<div class="moz-text-flowed"
style="font-family: -moz-fixed; font-size: 13px;" lang="x-western">Timo,<br>
<br>
I joined the lemonade list for the new IMAP sending protocol and I mage
the following suggestion about using IMAP as a front end for SMTP. The
idea would be that a client could authenticate to IMAP, then ask for a
tunnel to the SMTP server. - Here's my message. I thought I'd get
people thinking.<br>
<br>
---------------------<br>
<br>
OK thanks. I would clarify what I'm proposing.
<br>
<br>
I looked at the current proposal and what I'm proposing might be in
addition to rather than instead of the current proposal. LDELIVER as it
is now offers capabilities of sending messages and forwarding
attachments without downloading them, leaving more power on the server
side. This is important for mobile clients with limited power on the
client end.
<br>
<br>
What I'm suggesting is something in addition to LDELIVER where we add
SMTP-TUNNEL as a capability. This is for laptop users who have to deal
with finding an outgoing smpt server and who might be behind a firewall
that blocks smtp ports.
<br>
<br>
What is different about my proposal is that what I'm suggesting isn't a
straight pass through at the beginning. The client has to talk to IMAP,
then authenticate, and then upon successfil authentication would ask
for an SMTP connection to the local smtp server. At that point it is a
tunneled connection.
<br>
<br>
1) This allows the IMAP ports to be used for SMTP and avoid port
blocking.
<br>
2) It uses the same IMAP authentication for SMTP so outgoing SMTP nee
not be configured separately. It merely acts as an authenticated
condiut to get to SMTP.
<br>
3) It would in no way interfere with future advancements in SMTP
technology at others were concerned about.
<br>
4) Client and server recoding would be trivial.
<br>
5) This could be used in place of SMTP-AUTH and would eliminate the
need for authenticated SMTP making server smtp configuration easier.
<br>
<br>
So - if you look at it as an addition then you don't have to choose
between them.
<br>
<br>
Stephane Maes wrote:
<br>
<br>
<blockquote type="cite" style="font-size: large;">Marc,
<br>
<br>
Based on the suggestions that we have received so far, we will publish
a proposed update. We are looking at smtp proxy options.
<br>
<br>
Note that LDELIVER contributes also in supporting server side
recomposition with upload of only body / header part diffs. I am not
sure that tunneling would allow this. But I am looking into it.
<br>
<br>
Thanks
<br>
<br>
Stephane
<br>
<br>
PS I still have an action item to provide the use cases / reasons /
pros of using it. I will distribute soon on the list.
<br>
_____
<br>
Stephane H. Maes, PhD,
<br>
Director of Architecture - RTCC & Mobile, Oracle Corporation.
<br>
Ph: +1-203-300-7786 (mobile/SMS); Fax / UM: +1-650-607-6296.
<br>
e-mail: <a class="moz-txt-link-abbreviated"
href="mailto:stephane.maes@oracle.com">stephane.maes@oracle.com</a>
<br>
IM: shmaes (AIM, Y!,Skype) or <a class="moz-txt-link-abbreviated"
href="mailto:stephane_maes@hotmail.com">stephane_maes@hotmail.com</a>
(MSN Messenger) <br>
-----Original Message-----
<br>
From: <a class="moz-txt-link-abbreviated"
href="mailto:lemonade-bounces@ietf.org">lemonade-bounces@ietf.org</a> <a
class="moz-txt-link-rfc2396E" href="mailto:lemonade-bounces@ietf.org"><lemonade-bounces@ietf.org></a>
<br>
To: <a class="moz-txt-link-abbreviated" href="mailto:lemonade@ietf.org">lemonade@ietf.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:lemonade@ietf.org"><lemonade@ietf.org></a>
<br>
Sent: Thu Aug 18 08:41:10 2005
<br>
Subject: [lemonade] Outside the box suggestion about Lemonade
<br>
<br>
Hello,
<br>
<br>
I'm Marc Perkel - and I'm new to this list. I run a span filtering
service called junkemailfiltercom and do some web hosting.
<br>
<br>
I've read sme of the discussion about LDELIVER and I just wanted to
throw out a wild idea and see where it goes.
<br>
<br>
The Problem: Sending email without having to separately config outgoing
SMTP so that an IMAP connection can be used especially by moble users
to send email.
<br>
<br>
So - suppose that instead of adding something complex - why not just
establish a tunnel to SMTP over IMAP?
<br>
<br>
Here's what I propose. The client when sending email would establish a
second IMAP connection to the server. One of the CAPABILITIES will be
SMTP-TUNNEL. After sending the command the IMAP server opens a
connection to the SMTP server and acts as a straight pipe through until
the connection is closed.
<br>
<br>
The advantage of this is that you can take your existing SMTP code and
instead of connecting it on port 25 you connect it on port 143. Then
everything you could do with SMTP is available. You would just need to
add a smal layer to the SMTP layer to authenticate to the IMAP server
and tell it to open a tunnel to the SMTP server. On the server side you
just connect to localhost:25 or whatever you configure it to and pass
data.
<br>
<br>
Basically what I'm suggesting is that IMAP act as a tunnel to SMTP
providing and authenticated connection using the same credentials as
the imap client uses.
<br>
<br>
Unless I'm missing something - and I might be - seems to me this would
be dirt simple to implement and wouldn't impose any of the limitations
to the SMTP protocol that other people here are concerned about.
<br>
<br>
Who likes this idea?
<br>
<br>
<br>
_______________________________________________
<br>
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<br>
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<br>
<a class="moz-txt-link-freetext"
href="https://www1.ietf.org/mailman/listinfo/lemonade">https://www1.ietf.org/mailman/listinfo/lemonade</a>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</blockquote>
<br>
<div class="moz-txt-sig"><span class="moz-txt-tag">-- <br>
</span>Marc Perkel - <a class="moz-txt-link-abbreviated"
href="mailto:marc@perkel.com">marc@perkel.com</a>
<br>
<br>
Spam Filter: <a class="moz-txt-link-freetext"
href="http://www.junkemailfilter.com">http://www.junkemailfilter.com</a>
<br>
My Blog: <a class="moz-txt-link-freetext"
href="http://marc.perkel.com">http://marc.perkel.com</a>
<br>
<br>
<br>
_______________________________________________
<br>
lemonade mailing list
<br>
<a class="moz-txt-link-abbreviated" href="mailto:lemonade@ietf.org">lemonade@ietf.org</a>
<br>
<a class="moz-txt-link-freetext"
href="https://www1.ietf.org/mailman/listinfo/lemonade">https://www1.ietf.org/mailman/listinfo/lemonade</a>
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