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

[Robert Schetterer]

Am 16.05.2014 21:24, schrieb Rick Romero:
>  Quoting Oscar del Rio <delrio at mie.utoronto.ca>:
> 
>> On 05/13/14 03:02 PM, Stephan Bosch wrote:
>>> Use of NULL envelope sender is generally recommended to prevent mail
>>> loops
>>
>> Unfortunately, many servers out there reject emails with NULL sender.
>> Some recent examples (real server names edited) :
> 
> Any domain hosted by RackSpace will reject a NULL sender for
> 'backscatter'. 
> 
> Bascially, 'backscatter' blockers assume all edge SMTP servers will have
> complete knowledge of the final delivery status - during the SMTP
> conversation - thus labeling all NULL senders as forged spam redirected to
> them via a bounce message. 
> 
> http://www.backscatterer.org/

this use of this rbl is widly broken, dont do it, unless you have fully
understand what you do

> 
> Rick

however if you want to change Return-Path

use

http://wiki2.dovecot.org/Pigeonhole/Sieve/Plugins/Extprograms

http://hg.rename-it.nl/pigeonhole-0.3-sieve-extprograms/raw-file/tip/doc/rfc/spec-bosch-sieve-extprograms.txt

with procmail/formail

this also might give you the chance to prefilter only do changes to
broken mail domain setups

you might also write some milter/policy server for submission host etc
and/or poke around with some SRS Solution

http://www.openspf.org/SRS

dont expect coders focus to broken setups


Best Regards
MfG Robert Schetterer

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