The SPF Lookup is a diagnostic tool designed to retrieve and validate Sender Policy Framework (SPF) records. It fetches the SPF record for a specified domain, displays it, and conducts a series of diagnostic tests to identify any issues that might affect email delivery.

SPF records allow domain owners to specify which IP addresses or subnets are authorized to send emails on their behalf. This helps reduce spam and fraud by making it more difficult for malicious actors to impersonate legitimate senders.