Need help fixing or making my DNS function properly So I can send/receive mail and configure TLS/SSL

So, I created My MIAB like a month ago I have an issue with my DNS and I’m not sure what it is, anyways I bought my domain name ( from and I setup glue records ( and
My external name servers are and I named my MIAB and the IP is

when I attempt to setup TLS/SSL it returns the following error "Saving debug log to /var/log/letsencrypt/letsencrypt.log Requesting a certificate for and 4 more domains Certbot failed to authenticate some domains (authenticator: webroot)… " Please help.

Also, when I sent a test email and it bounces back with the error " DNS Error: DNS type ‘mx’ lookup of responded with code SERVFAIL".

It appears that IONOS has your VPS behind a firewall. Ports 53, 465, and 587 are all blocked.

Thanks @alento, unblocking those ports did the trick.

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