CmdID / Commands
Query Sender Policy Framework records to validate e-mail senders. tldr-pages
On several platforms
Opens CmdID with your command. It is read in your browser and sent nowhere.
Check if an IP address is allowed to send an e-mail from the specified e-mail address
spfquery -ip 8.8.8.8 -sender sender@example.com
Turn on debugging output
spfquery -ip 8.8.8.8 -sender sender@example.com --debug