m3aawg.org
M3AAWG Best Practices for Managing SPF Records
This document covers best practices for how to properly construct and maintain an SPF record, as well as common errors and unintended consequences
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M3AAWG Protecting Parked Domains Best Common Practices
Failure to publish DNS records signaling that a parked domain does not send or receive email provides opportunities for third parties to abuse domains of this nature. Domains that are similar to well-known domains are especially vulnerable to such attacks.