$ORIGIN example.
$TTL 5m

@ IN SOA dns.example. webmaster.example. (1 0m 0m 0m 5m)

@ NS dns.example.

moxacmepebble.mox1  A 172.28.1.10
moxmail2.mox2       A 172.28.1.20
dns                 A 172.28.1.30
acmepebble          A 172.28.1.40
test                A 172.28.1.50
localserve.mox1     A 172.28.1.60
postfixmail.postfix A 172.28.1.70

postfix MX 10 postfixmail.postfix.example.
postfixdkim0._domainkey.postfix TXT "v=DKIM1;h=sha256;t=s;k=ed25519;p=a4IsBTuMsSQjU+xVyx8KEd8eObis4FrCiV72OaEkvDY="
postfix TXT "v=spf1 ip4:172.28.1.20 -all"