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. _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org