There are 2 repositories under sender-policy-framework topic.
Postfix SRS forwarding agent
Compact large SPF chains into flat blocks of IP addresses
A PowerShell module to verify that your Office 365 DNS records have been set up correctly.
SPF Milter for Docker
Gathers the spf record of the given target domain using bash scripting ⚡
📩 Parse and generate SRS (Sender Rewriting Scheme) email addresses. (Abandoned)
Fast lightweight SPF mail filter for sendmail