Automatically check for SPF misconfigurations that could result in email spoofing

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Email spfjack
Overview

SPFJack

Email spoofing is dead, but misconfiguration never dies.

Purpose

This project is designed to take in domain names and review their SPF records for any issues that could result in email spoofing becoming possible.

The list of planned misconfigurations is as follows:

  • +all mechanism existing.
  • ip4, ip6, or a mechanisms with hosts containing open SMTP relays.
  • a, mx, and ptr mechanisms for domains that are not registered.
  • exists mechanisms existing. This can be a bit more complicated, see the SPF Domain spec and the _spf.salesforce.com record
  • include mechanisms for domains that are not registered. Recursively evaluate the SPF record for the include specified domain.
  • redirect modifier for domains that are not registered. Recursively evaluate the SPF record for the redirect specified domain.
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