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Al Iverson spent 15 years running deliverability for a major email platform, and this is his running commentary on what mailbox providers are actually doing right now. Once you have the basics working, this is where the real, current edge cases live: mailbox provider policy changes, blocklist behavior, and DMARC enforcement shifts that generic guides do not track.
Spam Resource: All Things Deliverability
From Al Iverson by Al Iverson
- Deliverability rules change over time as Gmail, Outlook, and Yahoo tighten policy, treat any static guide as a snapshot
- Authentication is necessary but not sufficient, sending behavior and complaint rates matter just as much
- Blocklists and reputation systems are opaque by design, so building margin matters more than chasing a perfect score
