* Viktor Dukhovni:
> I strongly do not recommend using LDAP for per-user transport lookups.
Shame that it does not scale, because it works. I have tried using a
combination of LDAP-based virtual_alias_maps and hashed transport_maps
as per your suggestion, but have not yet quite achieve the result I am
looking for.
Let me modify the pseudocode to describe my goal in more detail:
x = ldap_lookup_recipient_record(envelope_to_address)
if x.has_attribute(alpha)
reject_with_code_4xx(message=value_of_attribute(alpha))
else
relay_message(nexthop=value_of_attribute(beta))
When I use transport lookups, this is possible, for example by setting
attributes alpha="retry:Unavailable" or beta="smtp:[somehost]".
I tried to emulate this by using virtual alias lookups which return
alpha="pause.domain.tld" or beta="route.domain.tld", combined with a
transports hash map containing
pause.domain.tld retry:Unavailable
route.domain.tld smtp:[somehost]
Alas, when I do it this way, Postfix accepts email for users with the
alpha attribute and then stores them as deferred in the queue. I need to
reject with "4xx Unavailable" instead.
I feel like I am close but overlooking something.
-Ralph
