For your provider

Mailgun

Mailgun's domain-verification table publishes the SPF v=spf1 include:mailgun.org ~all.

v=spf1 include:mailgun.org ~all

That same table lists MX 10 mxa.mailgun.org and 10 mxb.mailgun.org for receiving on the domain, and a CNAME to mailgun.org for click, open, and unsubscribe tracking. The DKIM value is the one in Domain Verification and DNS in the Mailgun control panel. Mailgun may show more than one DKIM key. It says only the key the domain is configured to use has to verify.