Resources for testing your SPF records. There are benefits of each as some will check things others won’t.
- https://www.dmarcanalyzer.com/spf/checker/ Requires you to enter the SPF record which is useful for testing without updating DNS and has some other nice checks.
- https://www.spf-record.com/analyzer Looks up and checks the SPF record with a lot of checks.
- https://mxtoolbox.com/spf.aspx Another checker.