On 10/03/2020 17:55, Wietse Venema wrote:
THAT is a DNS resolver issue. If a domain has no MX record the
resolver should say sa IMMEDIATELY, instead of forever returning
NO RESPONSE.

Again, with proper resolver will IMMEDIATELY reply that the MX
record does not exist, allowing Postfix to proceed IMMEDIATELY.

With your broken resolver, Postfix gets NO RESPONSE, and therefore
it MUST NOT proceed.

        Wietse

You mean that I should modify standard configuration for my dns server (resolver) to force reply that MX record does not exist, instead of "Host doman.com not found: 2(SERVFAIL)" ? I don't really know that my actual nameserver configuration it's a "broken" configuration, I belive that it's somehow a "standard" configuration.
And what if server's resolver isn't managed by me? Let's say:

# cat /etc/resolv.conf
nameserver 8.8.8.8

Catalin Bucur

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