Everything these read is published in DNS by whoever set your mail up. Nothing is stored, nothing is sent anywhere, and every answer shows the record exactly as it stands so you can check it yourself.
Can someone send email pretending to be you? SPF, DKIM and DMARC read together, in one answer.
Your SPF record as published, and the DNS lookup count against SPF’s hard limit of ten.
The selectors mail providers actually use — and what a miss does and does not prove.
Your policy read exactly. p=none publishes a record but enforces nothing, and we say so.
Where your mail is delivered, in priority order, with the hostnames resolved.
These read public records. They cost us almost nothing to run, and a business that can see what its own domain publishes usually already knows what it wants done next. If that turns out to be work for us, the price is written down before anything is touched — and if it does not, the answer was still true.
One thing we will not do: tell you a domain is safe or unsafe. We show what is published, and when a record cannot be read we say that instead of guessing.