On 2009-08-15 Ross Boylan <[email protected]> wrote:
> On Sat, 2009-08-15 at 09:34 +0200, Andreas Metzler wrote:
>> Ross Boylan <[email protected]> wrote:
>>> On Thu, 2009-08-13 at 20:46 +0100, Mike Cardwell wrote:
[...]
>>>> helo_data = upstrm185.psg-ucsf.org
[...]
>> you could use a dnsdb lookup to keep it up to date automatically.
>> helo_data = ${lookup dnsdb
>> {ptr=$sending_ip_address}{$value}{$primary_hostname}}
> Does this impose much of an extra load?
Hello,
I /think/ the extra overhead should be low if you are running a local
caching DNS server which afaik is best practice anyway when running a
SMTP server.
> exim says it caches queries but it's not clear if that includes dnsdb,
> or that it should. Also the cache is only per process. Similarly DNS
> also caches. I don't know how much different that makes, esp if there
> is some DNS failure.
defer_never is probably a must, however I guess a failure to resolve will
slow down things a lot.
> Also, the IP address could change as well as the name.
$sending_ip_address will change accordingly.
cu andreas
--
`What a good friend you are to him, Dr. Maturin. His other friends are
so grateful to you.'
`I sew his ears on from time to time, sure'
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