Michael Alan Dorman:
> Hey, all,
>
> I manage a high-volume mail installation, using an after-queue content
> filter for spam filtering.
>
> We use an ldap transport map (actually a couple of them) to direct each
> recipient's email to it's appropriate final destination.
>
> I recently got some errors about timeouts in the transport map lookup,
> which seemed weird, since we're really not delivering all that much
> mail---95%+ of the stuff that comes in goes into the filter and never
> comes back out.
>
> I was startled (make fun of me if you wish :) when I realized that each
> accepted message is causing a lookup on the transport_map, *even though*
> the system knows it's just going to send them to the after-queue content
> filter.
The transport map can reject a recipient at SMTP RCPT TO time,
by resolving the recipient to the error(8) or retry(8) transport.
The transport map must therefore be searched BEFORE the filter.
Wietse
