I recently enabled DNSSEC for my domain and now I wanted to set a TLSA record. I searched through various posts regarding the 110 issue and I found the following problems on my side:
nc -6 mailcow.domain.tld 25 returns nc: getaddrinfo for host "mailcow.domain.tld" port 25: No address associated with hostname
nc -4 mailcow.domain.tld 25 returns a successful 220 though
docker compose exec php-fpm-mailcow nc -vz mailcow.domain.tld 25 returns nothing for me
Everything else about my mailcow works perfectly fine. I can send/receive mails and I have sucessfully set up all other DNS entries. Judging by the errors I found something seems wrong about my IPv6 configuration but I can’t quite figure it out. I have Mailcow as an Ubuntu KVM behind an OPNsense with all suggested ports forwarded to it. UFW is turned off