duplicate mail delivery

9 msg	smtpd_hard_error_limit vs greylisting
3 msg	Problems with a smarthost with a higher rate of...
5 msg	bounce problem
6 msg	Postfix and Spamassassin on seperate machine
1 msg	[Fwd: [Fwd: Re: user unknown]]
1 msg	relay problems
2 msg	Why NOQUEUE: filter: RCPT...Recipient address t...
3 msg	Occasional transport issue (spamassassin: Conne...
2 msg	Postfix amavis/spamassassin
5 msg	Spam MAIL FROM and RCPT TO a local account.
6 msg	Question regarding smtpd_sender_login_maps
1 msg	status=bounced, unknown user weirdness
2 msg	virtual_alias_domains and relay_domains
3 msg	SASL Question: How to block !LOCAL_LAN?
9 msg	Postfix busy, linux idle
31 msg	lots of 'lost connection after' : need help wit...
4 msg	Queue question

duplicate mail delivery
\ Martin Simovic (29 Aug 2007)
. \ Victor Duchovni (29 Aug 2007)
. . \ Martin Simovic (30 Aug 2007)
. . . \ Victor Duchovni (30 Aug 2007)

3 msg	RBL checker
3 msg	Loop error

Subject:	duplicate mail delivery
Group:	Postfix-users
From:	Martin Simovic
Date:	29 Aug 2007

Hi,

i am using postfix 2.3 (debian etch) with virtual users only

i can observe following behaviour: if a user (j...) is a
member of more than one alias (st...,
techni...) an email adressed to both staff@.. and
technical@.. is delivered to this user twice.

this is logical behavior, however some sort of duplicate suppresion
would be desired.

i know this is a known issue, i've done research on web, mailing
lists, etc.
know about solution for postfix < 2.3

my question is:

1. is there any progress in this issue since last posting about this
subject (think it was may/2007)

2. would there be an alternative to duplicate suppression, e.g.
instead of preforming this on MTA pass this task to
- LDA (in my setup i use dovecot)
- Sieve ?

i did quite an extended research regarding to dovecot LDA / Sieve,
without success. in my meaning dovecot could be able to perform this
as it keeps index of imap folders (way to check for an existence of a
message in inbox)

thanks,

martin.