[pfx] Re: Duplicate deliveries of expanded addresses (Was: Re: Avoiding message doubling via virtual aliases)

Ignore the nay-sayers...

On Mon, 18 May 2026, Wietse Venema via Postfix-users wrote:
>> [...]
>> Thanks, thanks.  But really, i had only missed aka did not realize
>> what
>>
>>     enable_original_recipient = no
>
> I exists so that domain-in-a-mailbox can distinguish different
> recipiemts by their X-Orginal-To: header.
> 	Wietse
>
>> really does.  It is exactly the configuration toggle that i need.
>> (For myself.  Given Jaroslaw Rafa's statement it would likely be
>> "super-cool" if the behaviour could be configured on a target
>> domain or recipient base, like with regex flags or what do i know.
>> I have that simple domain layout, with different names but only
>
> As a de-optimization feature for a niche use case, X-Original-To:
> related support pervades Postfix allready more than desirable.

Don't let your original impetus get in the way of a good and necessary 
feature. It also enables distinguishing between aliases which a Bcc: is 
sent to; consider the emotional investment in delaying email rejection 
(smtp_delay_reject), illustrated by this statement: "Postfix can log more 
useful information."

Well, in the case of BCCs to aliases, X-Original-To: is absolutely "more 
useful information".

--

Fred Morris, internet plumber

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