[Dovecot] qmail and LDA: passdb didn't return userdb entries

[Timo Sirainen]

On Tue, 2008-12-02 at 15:35 +0100, Alessio Cecchi wrote:
>   passdb:
>     driver: checkpassword
>     args: /home/vpopmail/bin/vchkpw
>   userdb:
>     driver: prefetch
>     args: uid=89 gid=89 home=/home/vpopmail/domains/%d/%u

The args for prefetch userdb don't do anything. Prefetch only returns
what the passdb had already looked up. This doesn't work with deliver,
which doesn't authenticate but instead just wants to do a userdb lookup.
Since there's no userdb, it returns the "passdb didn't return userdb
entries" error. That's actually a bad error message, I fixed it now to
give "userdb lookup not possible with only userdb prefetch".

So, what to do about it? I guess you could change userdb prefetch to
userdb static. It looks like you already have its parameters set up.
You'll also need to add allow_all_users=yes parameter and make sure your
MTA rejects invalid users.

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