On 18/03/2021 15:05, SysAdmin EM via Exim-users wrote:
   drop
   dnslists = dnsbl.domain.com
   message = $sender_host_address is listed in $dnslist_domain\
   ${if def:dnslist_text { ($dnslist_text)}}

The idea would be to establish a waiting time and if in case of not
answering the DNS query after 5/10 seconds, discard it.

It should be doing that already.  If you can repeat the situation,
please get a debug run (with timestamps)
--
Cheers,
  Jeremy

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