Re: [Exim] lookups, restraining lookup.

I would make it IP-based, rather than hostname based. Save the IP's
from POP then check the IP of an SMTP against that list. Ignore reverse
DNS entirely.

On Wed, 26 Jul 2000, Thorkild Stray wrote:

>
> I am having a little problem with my relay controlling. I have implemented
> pop-before-relaying (a custom solution using qmail-pop3d and a special
> checkpassword amongst other things).
>
> My problem is when the IP does not reversemap.
>
> I have read the faq and notices that Q0029 was my exact problem.
>
> Normally, I just look it up and check a cdb for the host name. When exim
> fails to find the hostname from the IP, it bails out and tells me it won't
> relay. Is there any way I can control the key for a single-lookup like
> cdb? I want to control it, so that I may use the $sender_host_address (if
> that is available at this time? ) instead of the resolved host.
>
> I can fix the problem by stuffing all the IPs in a file and using
> something like this:
>
> host_accept_relay = /local/relay.ips : cdb;/local/relay.hosts
>
> but I would like to have everything in one cdb. If I end up looking it up
> twice in cdb, I can live with that.
>
> Using allowed_unknown is not an option, since that would open me up for
> relaying from all non-resolvable IPs.
>
> Any other ideas of how to do this?
>
>

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