sender-policy-framework topic

Shell scripts for taming the SPF (Sender Policy Framework) records in order to fight 10-maximum-DNS-look-ups limit.

spf-tools

Compact large SPF chains into flat blocks of IP addresses

cetanu

Parse SPF record and determine if client IP is allowed to send email.

asggo

Postfix SRS forwarding agent

zoni

Ruby SPF Parser

trailofbits