Category guide
Best deliverability tools
Test, monitor, and improve inbox placement and sender reputation.
Editorial updated Jun 4, 2026·by Jordan Sauchuk
Our picks
Cold-email agencies and high-volume senders who need granular inbox-placement testing across providers (Gmail, Outlook, Yahoo, Apple) before campaign launch. The seed-list test methodology is the gold standard.
Read the GlockApps review →Lowest entry tier we tracked: $12/mo. Single-test deliverability checker. Send one email, get a spam score. Right pick when you need a fast 'is this email going to land?' check before a campaign launch.
Read the Mail-Tester review →Best free tier
Genuine free plan, not a 14-day trial in disguise. Right for evaluating the category without committing budget.
Read the MXToolbox review →
All deliverability tools we track
Sort by:
| Tool | Starts at | Integrations | Free tier | Affiliate link |
|---|---|---|---|---|
| MXToolbox | $0/mo | — | — | Try |
| Postmark Spam Check | $0/mo | — | — | Try |
| Mail-Tester | $12/mo | — | — | Try |
| Emailable | $30/mo | — | — | Try |
| GlockApps | $59/mo | — | — | Try |
Stay in the loop
Weekly note on what changed in the cold-email and sales tooling category. Brief.