After testing my forum email, I received the Discourse boilerplate response that mentions:
When I tried to validate on kitterman.com, it showed
“No valid SPF record found of either type TXT or type SPF.”
Mail-tester.com gives me the following result:
[SPF] Your server is authorized to use firstname.lastname@example.org
Sender Policy Framework (SPF) is an email validation system designed to prevent email spam by detecting email spoofing, a common vulnerability, by verifying sender IP addresses.
What we retained as your current SPF record is:
v=spf1 include:mailgun.org ~all
I’m not sure what I’m supposed to do next.