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Inbox Placement Auth Health Spam Avoidance

Email Deliverability Index (2025)

Seedlist-based inboxing across Gmail, Outlook, and Yahoo. Sort the leaderboard, expand a provider, and jump into tool reviews.

Updated: —

Methodology

  • Seedlist sends to Gmail, Outlook, and Yahoo from a warmed domain.
  • SPF, DKIM, and DMARC configured; auth health normalized to 0–100.
  • Identical lightweight HTML content for consistency; minimal tracking.
  • Composite balances mailbox inboxing with spam avoidance & auth health.

Note: Your audience, reputation, and templates will affect deliverability. Treat this as directional guidance.

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Some links may be affiliate (marked as sponsored). Rankings are editorial and independent.