It is commonly accepted that /24 IPv4 address spaces (256 hosts) are assigned to organizations, and among these networks, one or several IPs are used to send emails. M3AAWG Sender Best Current Practice (BCP)Īnd various Internet Engineering Task Force (IETF) Requests for Comment (RFC) related to Simple Mail Transfer Protocol (SMTP). There is plenty of documentation and recommendations on how to set up email servers for best deliverability, but the industry-accepted standards and best practices are But how do we ensure emails over IPv6 have an authenticated domain?Įmail authentication in the IPv4 landscape Because of the sheer size of the IPv6 space, it seems more efficient to build a domain-blocking and reputation system rather than an IP-blocking system. The change to IPv6 creates new challenges to keep spam out of email.
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