SPF records (Sender Policy Framework) are DNS entries that you add to your domain name. They will specify which IP numbers are allowed to send emails from your domain name. If email is spoofed from another location (such as saying that it’s coming from your domain when it really isn’t), SPF records will show that these are forged emails. When determining if an email is legitimate or not, SPF records is a great free step to help inbox delivery for you.