On Wed, Oct 16, 2024 at 02:05:09PM +0100, Dominic Preston via Postfix-users
wrote:
> When sending email via my email client, there is a delay of about 5 seconds
> before the email sends. I believe this is as a result of my ISP's DNS
> servers being unresponsive when responding to PTR record lookups for my
> client IP address.
>
> Is there any way to disable PTR record lookups for a given set of IPv4/IPv6
> addresses?
Configure the system resolver to be *authoritative* for the IP
address(es) in question, serving an "empty" zone (perhaps just SOA and
NS). If the address block is smaller than a /24, you'll need to list
each individual IP address as an empty zone. If larger, configure
multiple /24s, ...
Unbound, for example, can be configured to nxdomain specific names and
their subdomains (simpler than a proper empty zone).
--
Viktor.
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