What is the M3AAWG Sender Best Common Practices document?

The M3AAWG Sender Best Common Practices document provides comprehensive guidelines for legitimate email senders. It covers technical requirements, operational procedures, and behavioral standards representing industry consensus on responsible sending.

The document addresses authentication implementation, list management, bounce handling, complaint processing, and content standards. It represents collective wisdom from major ISPs, ESPs, and security professionals who participate in M3AAWG.

While not a certification program, following M3AAWG guidelines demonstrates alignment with industry expectations. Many certification programs incorporate M3AAWG recommendations. The document serves as authoritative reference for best practices that affect deliverability.

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