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Re: Bounce/System Notification Address Verification

2005-06-28 22:14:50

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

On Mon, 27 Jun 2005 Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote:

 On Mon, 27 Jun 2005 12:38:42 EDT, Hector Santos said:

> What is the BCP for allowing multiple RCPT TO when the return path is NULL?

 In general, since the message that's sent with the null MAIL FROM generates
 the RCPT TO from the inbound MAIL FROM, and there's only one of those, then
 you can only get one outbound RCPT TO.

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).

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