RFC 2821 (http://www.faqs.org/rfcs/rfc2821.html) says:
A MAIL command with a null
reverse-path appears as follows:
MAIL FROM:<>
As discussed in section 2.4.1, a relay SMTP has no need to inspect or
act upon the headers or body of the message data and MUST NOT do so
except to add its own "Received:" header (section 4.4) and,
optionally, to attempt to detect looping in the mail system (see
section 6.2).
...
4.5.5 Messages with a null reverse-path
There are several types of notification messages which are required
by existing and proposed standards to be sent with a null reverse
path, namely non-delivery notifications as discussed in section 3.7,
other kinds of Delivery Status Notifications (DSNs) [24], and also
Message Disposition Notifications (MDNs) [10]. All of these kinds of
messages are notifications about a previous message, and they are
sent to the reverse-path of the previous mail message. (If the
delivery of such a notification message fails, that usually indicates
a problem with the mail system of the host to which the notification
message is addressed. For this reason, at some hosts the MTA is set
up to forward such failed notification messages to someone who is
able to fix problems with the mail system, e.g., via the postmaster
alias.)
All other types of messages (i.e., any message which is not required
by a standards-track RFC to have a null reverse-path) SHOULD be sent
with with a valid, non-null reverse-path.
Implementors of automated email processors should be careful to make
sure that the various kinds of messages with null reverse-path are
handled correctly, in particular such systems SHOULD NOT reply to
messages with null reverse-path.
Hope this helps
E.
-----Original Message-----
From: [EMAIL PROTECTED]
Subject: No Originator
Ok when I am looking at the Queues for my IMC on my mail servers I see a
few e-mails waiting to be delivered that don't have an originator all it has
is <>. How do I find out who sent this mail. Running NT 4.0 sp6 Exchange
5.5 sp4
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