Mail::spf is an object-oriented perl implementation of the sender policy framework (spf) e-mail sender authentication system .

it supports both the txt and spf rr types as well as both spfv1 (v=spf1) and sender id (spf2.0) records, and it is fully compliant to rfcs 4408 and 4406. (it does not however implement the patented pra address selection algorithm described in rfc 4407.)