Re: envelope-to format (was: Re: Fwd: New Version Notification for draft-crocker-email-deliveredto-05.txt)

>> If we're speaking of a Delivered-To: header, then no I did not.
>> Exim does not currently have a specific facility for generating one.
>>
>> Perhaps you were thinking of my description of Envelope-to:

Right, the header described in draft-crocker-email-deliveredto-05 is in 
fact Envelope-To, not Delivered-To.

As far as I can tell, based on Viktor, Sam, Jeremy, and me descring the 
operation of software we know in detail, Delivered-To never records an 
envelope address.  When the string looks like a mailbox, that's a 
coincidence of implementation where the internal form happens to resemble 
the inbound envelope and the MTA's address translations were not too 
complicated.

Dave has pointed out that Gmail also adds a Delivered-To address, but I 
have looked and found no description of it at all, just some speculation 
in ServerFault.  I would guess that Google is familiar with existing 
Delivered-To and implemnted it the same way, as a loop breaker.  But 
that's just a guess.  Does anyone have any documentation or personal 
knowledge of what Gmail's header does?

Regards,
John Levine, [email protected], Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly