What do I enter for DNS settings?

I was looking through my mail log files and discovered my domain wasn't being resolved correctly. So I did sftp in Terminal and it returned an error that mail.myserver.com could not be resolved.
My servers IP address 192.168.88.8 and my DNS Server's DNS settings are 192.168.88.8 and 127.0.0.1. Is this correct?
Thanks

External forward and reverse DNS both need to be correct for your mail to be routed into your server and particularly for your outbound mail to be accepted by remote mail servers (and not perceived as a spam engine), and your local network needs to have DNS functional for at least the server. The reverse DNS inherently involves your ISP.
Put another way, yes, you need DNS for a traditional setup.
These days, it's usually safest to assume that everything needs DNS.
If you're not on a business-class DSL service, you'll end up establishing a relay through an authorized mail server somewhere else; with what amounts to relay through an SMTP mail server elsewhere with valid DNS.

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