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Re: Bounce/System Notification Address Verification

2005-06-28 05:24:56

On Tue June 28 2005 01:42, Robert A. Rosenberg wrote:

At 16:34 -0400 on 06/27/2005, Keith Moore wrote about Re: 
Bounce/System Notification Address Verification:

Wrong.  There is no prohibition that I'm aware of against using <> for
other purposes, and there are some standards that specifically require
using <> - e.g. MDNs and responses from mail robots, neither of
which are constrained to exactly one recipient.

OTOH: There is no requirement that the generator of these responses 
(when presented with a request/need to sent such a message to more 
than one recipient) create a single copy of the message as opposed to 
one personally addressed copy per recipient.

You are correct that there is no *requirement*, but sending an MDN to
multiple recipients is explicitly permitted and in fact may be specified
by the sender; RFC 3798:

   mdn-request-header = "Disposition-Notification-To" ":"
             mailbox *("," mailbox)

N.B. multiple MDN recipients may be specified.

Rejecting what is explicitly permitted is probably not a good idea unless
there is some ancillary information or some overriding consideration.

Administratively rejecting specific permitted, useful, non-harmful
information that users have explicitly requested is probably not sound

Creating multiple copies  
preserves the "Only One Recipient for a 'Mail From <>' message" rule.

Where exactly is that "rule" specified?

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