On Thu, May 20, 2021 at 09:18:56PM +0300, basini...@gmail.com wrote:

> Thanks Viktor.
> 
> So to add this "custom smtp transport" do I need to add a section in
> main.cf just like "smtp unix", but with a custom "service type" column
> and the additional option `-o smtp_host_lookup=native`?

That'd master.cf, and a custom service name.  Right now you typicall
have:

    smtp unix ... smtp
    relay unix ... smtp
        -o ...

you would add:

    smtp-nondns unix ... smtp
      -o smtp_host_lookup=native
      -o disable_dns_lookups=yes

Then of course in transport(5):

    example.com smtp-nondns:[somehost]

-- 
    Viktor.

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