Deliverability
Whether your email actually reaches inboxes rather than spam folders or silent rejection. Driven by authentication, sender reputation, list quality, and engagement.
Free · no signup · last reviewed August 29, 2026
The definition
Whether your email actually reaches inboxes rather than spam folders or silent rejection. Driven by authentication, sender reputation, list quality, and engagement.
Why it matters to an owner
The invisible tax on every email metric: a 20% open rate might be great writing reaching half your list. Check the plumbing before blaming the prose.
Keep going
This is the work. Want it done?
Everything here is free to use yourself — that’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.