[Dovecot] mime support for pigeonhole

[Steffen Kaiser]

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On Thu, 6 Feb 2014, Robert Schetterer wrote:
> Am 06.02.2014 10:41, schrieb Tim Dickson:
>> Very useful blocking filter, many thanks.
>> Does it generate backscatter.?
>
> No , should reject at smtp income data stage, but look
        ^^ I would say "must" in order to avoid backscatter.
As soon as you've accepted the message, you must generate a bounce.

> http://www.postfix.org/header_checks.5.html
> for more info
>
>> I have come across a number of spam emails which have more than one
>> address in the from field. Would this filter send the spam to those

If you reject at SMTP transmission time, no bounce is generated at all, 
but a negative SMTP reply code.

>> addresses by way of a mail bounce.?

The "From" header of a message is not consulted, when the bounce message 
is generated. Bounces are sent to the envelope sender, either passed by 
the MTA or taken from the Return-Path header.

- -- 
Steffen Kaiser
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