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Re: Bounce/System Notification Address Verification

2005-06-29 05:03:05

On Wed June 29 2005 00:30, Robert A. Rosenberg wrote:

At 13:50 +0100 on 06/28/2005, Tony Finch wrote about Re: 
Bounce/System Notification Address Verification:

However if the return path might have been an alias which expands to more
than one address, and this can reslult in legitimate bounces with more
than one recipient.

No it doesn't. The original message has ONE recipient (the alias) and 
gets delivered to it. At that point the alias gets expanded and 
creates a new message which is sent to each recipient. Unless 2 or 
more recipients are hosted at some domain other than the one where 
the alias is hosted, each copy is delivered directly to their mailbox 
(as if the message had arrived with all the addresses explicitly 
listed as RCPT-TOs).

You might want to reread Tony's statement carefully.  Perhaps an
example will help:

Original message:
Return-Path: admin-group(_at_)example(_dot_)net

Return-Path: <>
To: admin-group(_at_)example(_dot_)net

which may well be expanded to multiple RCPT TO mailboxes.

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