Re: socket trace

Mail From: Is the sender.
Rcpt To: Is the recipient.

that is basically all the information you need to send an e-mail.  The next
command is DATA.
Everything else falls under data.

This is something I sent directly from the SMTP server using:
TELNET '172.22.28.53' PORT(25)
mail from:jimlangst@conexfreight.com
rcpt to:jimlangston@conexfreight.com
data
heloo
.

Message-ID: <md5:2D10D019DE3469EDB80A596942539318>
Return-Path: <jimlangst@conexfreight.com>
Received: from [172.22.28.1] by file-server.conexfreight.com
          (post.office MTA v2.0 0813 ID# 0-40010U100L2S100) with SMTP
          id AAA85; Fri, 30 Mar 2001 09:12:49 -0800
X-Mozilla-Status: 8001
X-Mozilla-Status2: 00000000
X-UIDL: 20010330171151681.AAA85@[172.22.28.1]

heloo

This was sent with Netscape:

Return-Path: <jimlangston@conexfreight.com>
Received: from conexfreight.com ([172.22.28.60])
          by file-server.conexfreight.com (post.office MTA v2.0 0813
          ID# 0-40010U100L2S100) with ESMTP id AAA278
          for <jimlangston@conexfreight.com>;
          Fri, 30 Mar 2001 09:16:23 -0800
Message-ID: <3AC4BE94.CDD79C4F@conexfreight.com>
Date: Fri, 30 Mar 2001 09:12:52 -0800
From: Jim Langston <jimlangston@conexfreight.com>
Organization: Pacer International
X-Mailer: Mozilla 4.75 [en] (WinNT; U)
X-Accept-Language: en
MIME-Version: 1.0
To: jimlangston@conexfreight.com
Subject: Some Subject
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mozilla-Status: 8001
X-Mozilla-Status2: 00000000
X-UIDL: 20010330171623281.AAA278@conexfreight.com

heloo

Now you can see what the SMTP server fills out, and what netscape fills out.

As you suspect, the From: and To: you see is from the DATA section.  The first
message does not show me who it is from or to when viewed with netscape.  The
second one does.

Telnet is a powerful tool and can be used to directly control most protols,
including POP3 (port 110), IRC, SMTP, FTP Telnet session (not the data section),
etc...

HTH,

Jim Langston

Gene_Gaunt@ReviewWorks.com wrote:
> 
> I'm reading the data dump from my SMTP proxy, and a redundancy puzzles me.
> What's the difference between the e-mail addresses in the "Mail From:" and
> "Rcpt To:" SMTP commands, and the e-mail addresses in the "From:" and "To:"
> records in the MIME packet?   I open my Lotus Notes mailbox and see "FROM"
> and "TO" addresses.  Are these addresses coming from the SMTP commands, or
> are they coming from the MIME packet?
> 
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