[Dovecot] RFE: please add Return-Path: to sieve sent mail headers

[Steffen Kaiser]

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On Wed, 14 May 2014, Charles Marcus wrote:
> On 5/13/2014 3:02 PM, Stephan Bosch <stephan at rename-it.nl> wrote:
>> If you know what you are doing (think twice about that!), you can override 
>> this behavior using the sieve_vacation_send_from_recipient setting (if your 
>> Pigeonhole is recent enough): 
>> http://wiki2.dovecot.org/Pigeonhole/Sieve/Extensions/Vacation#Configuration 
>> Regards, Stephan. 
>
> Just be sure you understand why...
>
> I recommend you read the pertinent RFC which explains the reasoning as to why 
> the null sender is recommended, and if you are going to use another/real 
> address, only use one that will never auto-respond to *anything*:

Yep, those using different <> null senders should be aware, that there 
envelope sender rewritings, such as BATV and SRS0, that make the address 
unique each time by adding hashed timestamps or something like that. Those 
rewritings undermine the vacation database.
I hope that those implementations generate an unique address per day and 
not per message. :-)

> http://tools.ietf.org/html/rfc3834#section-3.3
>
> Specifically:
>
>   The primary purpose of the MAIL FROM address is to serve as the
>   destination for delivery status messages and other automatic
>   responses.  Since in most cases it is not appropriate to respond to
>   an automatic response, and the responder is not interested in
>   delivery status messages, a MAIL FROM address of <> MAY be used for
>   this purpose.  A MAIL FROM address which is specifically chosen for
>   the purpose of sending automatic responses, and which will not
>   automatically respond to any message sent to it, MAY be used instead
>   of <>.
>
>
>

- -- 
Steffen Kaiser
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