With this tool you can look up multiple SPF records for domains at once. We're talking about a DNS lookup for TXT records that starts with the spf syntax "v=spf". The script will not validate the SPF record, it only does a lookup. So if you want to do a spf check in bulk than you have to use this tool.
SPF records are used to prevent spammers to use your domain as sender address. In the SPF record you can validate your own email servers or email services to send validated email. If the ip address of the sending server is not present in the SPF DNS TXT record the mail is marked/flagged as spam.
How to use? Put a domain or website url on each row of the input field. Then press start and you will get the results.