Expand and debug SPF macros to verify how your SPF record evaluates for a given sender IP, HELO hostname and envelope domain. Supports all standard SPF macro variables.
SPF macros are placeholders in SPF records that expand to values from the current SMTP transaction. Common macros include %{i} (sender IP), %{s} (sender email), %{d} (envelope domain) and %{h} (HELO hostname). They are often used in exists: mechanisms for advanced per-IP reputation checking.