[Dovecot] Why : dovecot_destination_recipient_limit = 1 ?

[Koenraad Lelong]

Markus Schönhaber schreef:
> Koenraad Lelong:
> 
>> I'm trying to activate sieve. In all tutorials I have seen I need to set 
>> dovecot_destination_recipient_limit = 1 in Postfix's main.cf. Can anyone 
>> explain why ?
>> I like to know because when I set this and the dovecot transport in 
>> Postfix, I'm having problems when aliasses are used that map to 
>> different recipients, i.e. info at ... results in user1 at ..., user2 at ..., 
>> etc. The problems are an error from Postfix :
>> Oct 30 09:25:19 lace3 postfix/pipe[19729]: 8A77E2D5B5B: 
>> to=<some.body at some.where.org>, relay=dovecot, delay=2390, 
>> delays=2390/0.04/0/0.01, dsn=4.3.5, status=deferred (mail system 
>> configuration error)
>> Oct 30 09:25:19 lace3 postfix/pipe[19729]: warning: pipe flag `D' 
>> requires dovecot_destination_recipient_limit = 1
> 
> Well, the last message says it all: you've instructed postifx' pipe to
> add a "Delivered-To" header field to the message. And this obviously
> can't work when delivering one message to multiple recipients in one pass.
> See also:
> http://www.postfix.org/pipe.8.html
> 
Thanks for your response, Markus.
Am I to conclude that what I'm trying to do is impossible then, with 
dovecot ?
I would like to enable sieve on a system where I have aliasses which 
point to multiple recipients.
For some reason dovecot needs the DRhu flags. The D flag needs 
dovecot_destination_recipient_limit=1 which prevents those multiple 
recipients.

Or am I missing something ?

If I would remove the D-flag, how likely it is to get a loop ? 
Unfortunately I don't have a test-system at the moment.

Regards,

Koenraad Lelong.