How to make adguard dns and server mail work?

Question

Domain Name System

Installed Adguard home (dns) and bind9 (dns) on the server [all work on port 53]
If Adguardhome works, then mail on the server does not work (dovecot & postfix)
Tried to change the bind9 port to 55 in the

/etc/named.conf config

listen-on port 55 { localhost; };
listen-on-v6 port 55 { localhost; };

Worked only partially:
Internal mail works fine
External only sends, but does not arrive.

Is it possible to make both mail and adguard home work at the same time?

Answer 1

maybe
you changed the wrong port to 55

Answer 2

Have you tried reading the logs? There it is usually written for what reason mail does not leave.

Answer 3

I don’t understand what kind of mail and how it is connected with Adguard DNS. Look here, maybe it will be useful https://bafista.ru/adguardhome-i-synology-nas-blok...