Re: nonexistent virtual account received

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nonexistent virtual account received
\ Tomas Macek (13 Apr 2007)
. \ mouss (13 Apr 2007)

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Subject:	Re: nonexistent virtual account received
Group:	Postfix-users
From:	mouss
Date:	13 Apr 2007

Tomas Macek wrote:
> Hi, I'm using Postfix 2.2.10, but I hope this would be the same in
> newer versions.
> I have 2 tables with aliases in pgsql. First for mail adress aliases
> and one for domain aliases - this shlould be OK.
> The domains are aliased as follows (lookup configured in
> alias_domains_maps.cf):
>
> @ourdomain2.cz @ourdomain1.cz
> @ourdomain3.cz @ourdomain1.cz
> ...

These are called wildcard aliases (all users in a domain get redirected
to the same user in another).
>
> When I send an email to a nonexistent mailbox, for example
> nonexistent, it is rejected just on the rcpt to in the
> smtp. Works great. But when I sent an email to a nonexistent mailbox
> in aliased domain, for example nonexistent, it is
> accepted via 25 port into postfix and then is bounced with
> "status=bounced (unknown user: "nonexistent")". Why this
> is not rejected just on rcpt like when sending to
> nonexistent?

http://www.postfix.org/virtual.5.html
says:

Note: @/domain/ is a wild-card. With this form, the
Postfix SMTP server accepts mail for any recipient
in /domain/, regardless of whether that recipient
exists. This may turn your mail system into a
backscatter source: Postfix first accepts mail for
non-existent recipients and then tries to return
that mail as "undeliverable" to the often forged
sender address.

do you see the "accepts mail for any recipient"?

replace your wildcard aliases with per-user aliases. do this with sql
statements: only return a result if the "target" user exists in the
virtual mailbox table. this assumes you have a one depeth (recursion)
level alias system. implementing it with any depth level (foo1 => foo2
=> foo3 => ...) is harder.
>
> My user alias accounts looks like this (lookup configured in
> alias_mailbox_maps.cf):
> user2 user1
> user3 user1
> ...
>
> And my account map (lookup configured in virtual_mailbox_maps.cf):
> user1 /var/accounts/user1
> user2 /var/account/user2
>
> What I'm doing wrong? I cannot find the problem from most debugging
> output, the same like from the virtual(5) doc.
>
> This is my configuration:
> -------------------------
> virtual_mailbox_domains = ourdomain1.cz
>
> virtual_alias_maps = pgsql:/etc/postfix/pgsql/alias_domains_maps.cf
> pgsql:/etc/postfix/pgsql/alias_mailbox_maps.cf
>
> virtual_mailbox_maps =
> pgsql:/etc/postfix/pgsql/virtual_mailbox_maps.cf
>
> Can anyone help me please. Many thanks
> Tomas
>
>