Re: migration from 2.3 to 2.4 : postfix can't deliver via lmtp

> On 27/03/2026 13:28 EET Stefan G. Weichinger via dovecot <[email protected]> wrote:
> 
>  
> Am 27.03.26 um 11:54 schrieb Stefan G. Weichinger via dovecot:
> > 
> > I am in the process of upgrading and rewriting my config.
> > 
> > I can access IMAP etc ... so my database access is working.
> > 
> > I have issues with LMTP: postfix can't deliver to dovecot.
> > 
> > The postfix-confiog wasn't touched at all.
> > 
> > the error:
> > 
> > Mar 27 11:46:37 co dovecot: auth([email protected]): Error: userdb: 
> > client doesn't have lookup permissions for this user: userdb reply 
> > doesn't contain uid (to bypass this check, set: service auth 
> > { unix_listener /run/dovecot/auth-userdb { mode=0777 } })
> > 
> > 
> > What I don't understand: I configure this:
> > 
> > service auth {
> >    unix_listener /var/spool/postfix/private/auth {
> >      group = postfix
> >      mode = 0666
> >      user = postfix
> >    }
> > }
> > service auth-worker {
> >    user = postfix
> > }
> > service lmtp {
> >    user = vmail
> >    unix_listener /var/spool/postfix/private/dovecot-lmtp {
> >      group = postfix
> >      mode = 0660
> >      user = postfix
> >    }
> > }
> > 
> > protocol lmtp {
> >    mail_plugins = sieve
> >    postmaster_address = [email protected]
> > }
> > 
> > And in postfix:
> > 
> > virtual_transport = lmtp:unix:private/dovecot-lmtp
> > 
> > virtual_uid_maps = static:5000
> > virtual_gid_maps = static:5000
> > local_transport = virtual
> > local_recipient_maps = $virtual_mailbox_maps
> > 
> > smtpd_sasl_auth_enable = yes
> > smtpd_sasl_type = dovecot
> > smtpd_sasl_path = private/auth
> > 
> > 
> > Where does "/run/dovecot/auth-userdb" come from?
> > 
> > I understand that according to my config /var/spool/postfix/private/auth 
> > should be used?
> > 
> > ls /var/spool/postfix/private/auth -l
> > srw-rw-rw- 1 postfix postfix 0 Mar 27 11:45 /var/spool/postfix/private/auth
> > 
> > ls /var/spool/postfix/private/dovecot-lmtp  -l
> > srw-rw---- 1 postfix postfix 0 Mar 27 11:45 /var/spool/postfix/private/ 
> > dovecot-lmtp
> 
> I think I have it, at least it works now.
> 
> I added this block from 2.3 ...
> 
> service auth {
>    client_limit = 1200
>    unix_listener auth-client {
>      group = postfix
>      mode = 0660
>      user = postfix
>    }
>    unix_listener auth-userdb {
>      mode = 0777
>    }
>    user = root
> }
> 
> I assume the 0777 etc aren't ideal.
> 
> Suggestions welcome.
> 
> But my basic setup seems to work now!
> 
> (thanks to all devs for their work, even when it's sometimes hard to 
> keep up ...)
>

0666 would be safer if it works. 

Aki

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