System status check errors(ports not accessible)

Hello Guys, i am having a problem with ports. I am using Microsoft Azure for hosting and Google domains for DNS. On System status checks, it is showing the following errors.

System

:heavy_multiplication_x:
Public DNS (nsd4) is not running (port 53).

:heavy_multiplication_x:
Incoming Mail (SMTP/postfix) is running but is not publicly accessible at XXXXXX

:heavy_multiplication_x:
Outgoing Mail (SMTP 587/postfix) is running but is not publicly accessible at XXXXXX

:heavy_multiplication_x:
IMAPS (dovecot) is running but is not publicly accessible at XXXXXX

:heavy_multiplication_x:
Mail Filters (Sieve/dovecot) is running but is not publicly accessible at XXXXXX.

Did you open the ports on the firewall?

Thank for your reply. Can u tell me how to open ports on firewall? Sorry i am new to this

I’ve never used Microsoft Azure. You should consult their Knowledge Base articles for information.