http://www.faqs.org/rfcs/rfc2821.html
6.1 Reliable Delivery and Replies by Email
When the receiver-SMTP accepts a piece of mail (by sending a "250 OK"
message in response to DATA), it is accepting responsibility for
delivering or relaying the message. It must take this responsibility
seriously. It MUST NOT lose the message for frivolous reasons, such
as because the host later crashes or because of a predictable
resource shortage.
If there is a delivery failure after acceptance of a message, the
receiver-SMTP MUST formulate and mail a notification message. This
notification MUST be sent using a null ("<>") reverse path in the
envelope. The recipient of this notification MUST be the address
from the envelope return path (or the Return-Path: line). However,
if this address is null ("<>"), the receiver-SMTP MUST NOT send a
notification. Obviously, nothing in this section can or should
prohibit local decisions (i.e., as part of the same system
environment as the receiver-SMTP) to log or otherwise transmit
information about null address events locally if that is desired. If
the address is an explicit source route, it MUST be stripped down to
its final hop.
All clear now?
Phil
---------------------------------------------
Phil Randal
Network Engineer
Herefordshire Council
Hereford, UK
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> [EMAIL PROTECTED]
> Sent: 29 January 2004 14:11
> To: Exchange Discussions
> Subject: IMS indicates outgoing from <> appears to be Spam
>
>
>
> Forgive me if this is elementary but my question is that if
> I have tested
> and have had others test and verify that my mail servers do not allow
> relaying why do I constantly see messages in the IMS Outbound
> Queue that
> show mail is from "<>" to various domains? All of these
> messages appear to
> be Spam. I seriously doubt I have infected machines doing this.
>
> Exchange 5.5 SP4 on 2k SP3. Any thoughts or direction is appreciated.
> Thank you.
>
> LABD
>
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