Re: T2 Retry with Delivery Receipt

[Martin W Sachs <mwsachs@us.ibm.com>]

I completely agree with your conclusion but I am curious about SMTP.  When
I send an email, I send it to the email address that I know for the
destination.  When I receive an email, the sender sends it to my email
address.  Yet the header information may show that this email has travelled
through lots of intermediary mailers.  I don't know how the routing
mechanism works but I do know that I don't have to care about it.  I am
doing end to end addressing.  And yes, it is below the level of ebXML but
it is an example of unreliable intermediaries.

Regards,
Marty

*************************************************************************************

Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com
*************************************************************************************



Dan Weinreb <dlw@exceloncorp.com> on 09/14/2001 09:51:05 AM

Please respond to Dan Weinreb <dlw@exceloncorp.com>

To:   Martin W Sachs/Watson/IBM@IBMUS
cc:   chris.ferris@sun.com, david@drummondgroup.com,
      ebxml-msg@lists.oasis-open.org
Subject:  Re: T2 Retry with Delivery Receipt



   Date: Fri, 14 Sep 2001 09:24:42 -0400
   From: Martin W Sachs <mwsachs@us.ibm.com>

   Sure but it is an example of how ebxml end to end RM can work through
   unreliable IMs.

It's an extremely important point that an SMTP mailer is not an IM.

The basic scenario involving an SMTP mailer is where the From host
sends email to host M, running a store-and-foward mailer, and then
host M later sends email to the To host.  This is *not* a multi-hop
ebXML MS connection.  It is a single-hop connection.  It is *not* like
Figure 8-2.  The From MSH calls the communcation layer saying "send
this message to the To MSH".  If the From MSH is using RM and does not
get an Acknowledgement, it retries, using plain vanilla hop-to-hop
retry.  The fact that there is an SMTP mailer in there is entirely
invisible to the MSH layer.  There is no need in this particular
example to add end-to-end retry and a RetryCount field in addition to
hop-by-hop retry, because it's just one hop.

-- Dan

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