postfix alias and dovecot quota

Nathan Schultheiss nathan at
Mon Jun 30 13:01:55 UTC 2014

I've the same problem.

Dovecot can reply REJECT when Postfix ask for know the quota of the real user.
But if the email it's alias, Dovecot does not know the email and reply DUNNO, but when the mail must be delivred by the LDA, Dovecot reject because the user it's over quota.

I search since several weeks how to fix that and for postfix ask the quota-service with the real user email and not the alias.
Because Postfix know the real user email because it's search it on the first time before ask Dovecot...

I don't understand that postfix can't have a feature for check the quota-service with the real user email and not the alias...

It's possible that I was wrong and not really understand the Postfix doku (that's really possible).

If anobody have one idea that would be great, because I'm really lost, and I think i'm not alone :)

Bests Regards,

----- Mail original -----
De: "Jiri Bourek" <bourek at>
À: dovecot at
Envoyé: Lundi 30 Juin 2014 13:37:26
Objet: Re: postfix alias and dovecot quota

On 30.6.2014 12:33, Nick Edwards wrote:
> On 6/29/14, Alexandre Ellert <aellert at> wrote:
>> Le 29 juin 2014 à 06:24, Nick Edwards <nick.z.edwards at> a écrit :
>>> it is the job of postfix to do this, aliases are just that, aliases of
>>> the real mail account, they do not exist in real storage, else, they
>>> would not be alias.
>> The problem i'm trying to solve is about dovecot capability to serve quota
>> status via Postfix policy server protocol.
>> It works fine when the destination address is a real mailbox, but if it's a
>> Postfix alias, then the email is not rejected because dovecot doesn't know
>> this user.
>> Maybe it's a wrong idea to try to make Postfix alias visible to dovecot.
>> Do you have another suggestion ?
> of course its wrong
> mail aliases are for MTA's *only*  its not for dovecot (or any
> pop3/imap server), if postfix is not saying oh ok alias foo really
> goes to user bar, do we;ll check out bar's quota, status etc,, then ur
> postfix is foobarred somehow.

I'm not completely sure about that. If you want to use Dovecot's 
quota-status to reject message during SMTP session, Postfix' smtpd 
process needs to do that and - to my knowledge - it's only able to pass 
recipient address, not the aliases involved.

I was looking for a solution to this few months ago as well. In the end 
I created sort of policy service proxy between Postfix and Dovecot. The 
proxy looks up aliases in database, converts them into real users and 
asks Dovecot about those. Final result is then reported back to 

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