Email Deliverability
Email deliverability is whether sent email reaches inboxes instead of spam, the silent gate under every email metric.
What email deliverability is
Email deliverability is whether sent email actually reaches inboxes: not just delivered somewhere, but landing in the inbox instead of spam, at the rates the list’s engagement deserves.
Why deliverability matters
Every email metric sits downstream of it: opens, clicks, and revenue all read as campaign failures when the real problem is placement. Mailbox providers score senders continuously, and a damaged reputation throttles the channel silently, no bounce, no error, just spam folders.
What deliverability depends on
- Authentication: SPF, DKIM, and DMARC in place
- Sender reputation: engagement high, complaints and bounces low
- List quality: permissioned, cleaned, never purchased
- Sending patterns: consistent volume, warmed-up domains and IPs
Frequently asked questions
How do you know deliverability is suffering?
Open rates sliding across the board, seed-test placements landing in spam, and postmaster tools showing reputation dips. The channel rarely announces the problem; the metrics whisper it.
How is bad deliverability fixed?
Stop the damage first, pause to unengaged segments, fix authentication, then rebuild: mail the engaged core, keep complaints near zero, and let reputation recover over weeks. There’s no support ticket to Gmail; behavior is the appeal.