[Dovecot] Feature request: add information to error message: client doesn't have lookup permissions for this user: userdb reply doesn't contain uid (change userdb socket permissions)

[Steffen Kaiser]

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Please add the information to this error, which socket has the problem and 
which uid access is and what is expected.

For instance, when the quota dict request fails, because of permission 
problems, you get a very detailed info about the current problem. And, 
further more, hints to solve it.

BTW: I'm trying to configure shared mailboxes for a virtual user system, 
when one user with ACLs on other mailboxes requests a LIST, I get this 
error. In my case, I solved the problem by chmod u+x auth-userdb .

Kind regards,

- -- 
Steffen Kaiser
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