Hi. I'd like to request an addendum to the WishList. It could
possibly be seen as an amendment of this one:
(191) 26-Aug-03 M Preserve $address_data for a verified recipient
The idea is to preserve it in the recipients data structure so that
local_scan can have access to it.
However, I want the cached $address_data to be visible to the routers
as well as local_scan. The reason for this is to be able to keep the
number of external lookups as small as possible, for performance
reasons. Quite often I end up setting up Exim like this:
begin acl
rcpt:
[...]
accept domains = +ldap_domains
endpass
verify = recipient
[...]
begin routers
getdata:
driver = redirect
domains = +ldap_domains
unseen
data = ""
address_data = ${lookup ldap {...}}
[...]
The reason is of course that after I run that first router, I've
made sure to fetch all the information I will possibly need during
subsequent routing, so the number of LDAP lookups is limited to one.
However, when a message arrives over SMTP (usually that's the case for
almost all messages, in my setups), two identical lookups are made,
one when verifying the recipient, and one when routing her. That's
costly and inefficient, as the result will always be the same.
What I would like to do is to simply add
condition = ${if def:address_data {no}{yes}}
to the getdata router, which will ensure that there will be only one
lookup per address.
Thanks,
--
Tore Anderson
