Re: [BULK] Re: SORBS contact

[Valdis.Kletnieks () vt edu]

On Fri, 29 Jul 2011 09:48:44 EDT, William Herrin said:

> Correction: It's a standard way to denote that "this mail is a bounce
> report." 

Correction to your correction: What the RFC actually says:

4.5.5.  Messages with a Null Reverse-Path

   There are several types of notification messages that 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, RFC 3461 [32]), and
   Message Disposition Notifications (MDNs, RFC 3798 [37]).  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.)

It's *not* just "bounce reports" (in particular, DSNs and MDNs are not
non-delivery (bounce) messages in the sense of section 3.7, and both
can be generated in response to *successful* deliveries).
generated for *successful* deliveries).

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