Ahoj,

Dňa Wed, 22 Jun 2022 10:14:27 -0400 Robert Steinmetz via Exim-users
<exim-users@exim.org> napísal:

> There are no IPv6 records set up and I've gone through with my ISP 
> (Comcast) to check the PTR records. The odd thing is that this only 
> seems to affect some users and usually those that have their own
> domain. Standard gmail.com accounts seem unaffected.

until you setup your IPv6 properly, you can use this in dnslookup
(or how you named it) router:

    dnslookup:
      driver = dnslookup
      ...
      ipv4_only = true
      # or
      #ipv4_prefer = true

I used this, when i start to use IPv6, if i remember properly. Check
details in docs...

regards

-- 
Slavko
https://www.slavino.sk

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