How to add SPF-record to debian?

Question

Domain Name System

Letters from my server do not reach recipients.
I read that you need to add a
mydomain.com entry. IN TXT "v=spf1 a -all"
I don't understand how and where

Answer 1

The record must be added on the NS server of your domain. But first you need to determine why the letters do not reach. The absence of an SPF record is just one, and not the most likely possible reason.