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spf

hMailServer: a free, open-source mail server for Windows and Linux. SMTP, IMAP and POP3, webmail, a REST API, the Control Panel and the browser Control Deck. AGPL-3.0-or-later. Maintained by Progressive Robot Ltd.

Cryptographic protocol and security-related protocol piece parser.

DMARC library and milter module implemented in Python.

spf is an open source implementation of the Sender Policy Framework (SPF) in Go.

It is used by the chasquid and maddy SMTP servers.

Full email server solution with docker

Mail Authentication Checker verify SPF, DKIM, DMARC and Root Domain hack to determine the security of a domain against spoofing/phishing attacks.

A Python module for calculating shortest paths between nodes in a graph using Dijkstra's algorithm.