Robert Kiessling:
> The implementation of dictionaries seems to allow only success and
> failure as result, not "temporary failure".

This is inaccurate. In several places the maps return a temporary
error condition.

> As a result, when smtpd checks users in the virtual_maps, virtual_maps
> refers to some external source like LDAP and this lookup fails
> temporarily, e.g. LDAP server not available for a short time, smtpd
> fails with a "User unknown" instead of something like "temporarily not
> available, try later".

The LDAP map returns DICT_ERR_RETRY in many places. The error is
in the smtpd code that is oblivious of DICT_ERR_RETRY results.

The find the places that need to be fixed:

    % grep 'maps_find\(virtual_maps' smtpd_check.c

I am pretty much swamped with other work, and suggest that you set
up a backup LDAP server, which I would recommend regardless.

        Wietse

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