Preface

SPF checker MxToolbox is a diagnostic tool that looks up SPF records for errors and ensures their validity. SPF or Sender Policy Framework allows domain administrators to create and publish a list of servers permitted to send emails from a particular domain. It protects your domain from spamming and phishing attacks attempted in your company’s name.

To use the MxToolbox SPF checker, you just need to enter your domain name in the given space, and you’ll receive a full-fledged report in just a few seconds. You can remediate the issues and update your SPF record to stay abreast of cybercriminals.

How MxToolbox SPF Record Checker Validates Your Record?

MxToolbox SPF record checker will validate SPF records on the:

• SPF record existence: The SPF checker MxToolbox requires an SPF record to start the validation process.
• Multiple SPF records in DNS: You can’t have more than one SPF record in DNS for each version.
• Maximum lookups: There’s a limit of a maximum of 10 DNS lookups. If you exceed the limit, your email messages will fail inspections.
• Ptr mechanism: The ptr mechanism is slow and unreliable; thus, its use is discouraged, and it’s a deprecated mechanism. 
• Unknown parts found: Content not specified by SPF is in use.
• +All mechanism used: The use of this tag is discouraged as it allows anyone to send messages from your domain.
• Record termination missing: The SPF checker MxToolbox checks if your record has either an ‘all’ mechanism or a ‘redirect’ modifier.
• Multiple fall-back scenarios: There shouldn’t be more than one SPF fall-back scenario. 
• DNS type ‘SPF’ used: Your SPF record should be in the ‘TXT’ format as the ‘SPF’ format is obsolete.
• Uppercase SPF: It isn’t mandatory to use lowercase characters, however, it’s considered a good practice.