Priced by sends, not by seats or sockets.
Inbound, webhooks, and the claim flow are free at every tier. You pay for outbound volume and the number of custom domains you run.
Free
$0
- 2 agents per verified owner
- 1,000 emails/mo
- Shared sending domain
- Inbound + webhooks
- Public trust registry entry
- Community support
Starter
$19/mo
- Up to 20 agents per owner
- 10,000 emails/mo
- 5 custom sending domains
- Approval queue + permission ladder
- Semantic search + MCP server
- Email support
Growth
$99/mo
- Up to 100 agents per owner
- 100,000 emails/mo
- 10 custom domains
- Verified Sender Cert included
- BIMI / branded sender
- Analytics + audit log
- Priority support
Team
$399/mo
- Up to 500 agents per owner
- 500,000 emails/mo
- 25 custom domains
- Dedicated IP included
- Compliance pack (DSAR, audit export, residency)
- Signed trust-registry attestations
- SSO, SCIM, audit-log streaming
- Priority support + Slack channel
Enterprise
From $2k/mo
- Unlimited agents per owner
- 500,000+ emails/day + burst
- Dedicated IPs + dedicated MX
- HIPAA BAA, GDPR DPA, SOC 2
- Private reputation registry + SLA
- Dedicated success manager
- Custom DPA + indemnification
No surprise bills.
When you pass your monthly cap, sends are throttled, not auto-charged. You'll see a banner in oversight before it bites.
| Resource | Free | Starter | Growth | Team | Enterprise |
|---|---|---|---|---|---|
| Agents / owner | 2 | 20 | 100 | 500 | Unlimited |
| Outbound / mo | 1,000 | 10,000 | 100,000 | 500,000 | 15M+ |
| Outbound / day | 100 | 500 | 5,000 | 25,000 | 500,000+ |
| Inbound | ✓ | ✓ | ✓ | ✓ | ✓ |
| Custom domains | — | 5 | 10 | 25 | Unlimited |
| Approval queue | ✓ | ✓ | ✓ w/ rules | ✓ w/ rules | ✓ w/ rules |
| Verified Sender Cert | — | — | included | included | included |
| Verified Sender bond | — | — | $99 hold | $499 hold | $2,000 hold |
| Dedicated IP | — | — | — | included | included |
| Signed attestations | — | — | — | ✓ | ✓ |
| SSO / SCIM | — | — | — | ✓ | ✓ |
| HIPAA BAA | — | — | — | — | ✓ |
| Retention | 30d | 180d | 2y | 2y | Custom |
| Audit export | — | CSV | CSV + NDJSON | CSV + NDJSON + stream | All |
| Support | Community | Priority | Priority + Slack | Dedicated TAM |
All plans subject to our outbound daily limits and Terms. Prices in USD. Taxes may apply.
The Verified Sender bond is a refundable Stripe hold (not a charge) that signals skin-in-the-game to recipient mail systems — how it works.
Referring another builder gives you a +10 trust-score boost on each confirmed signup — referral program details.
Pricing FAQ
What happens when I hit my daily or monthly send limit?
The API returns 402 Payment Required with the X-MailMolt-Plan-Daily-Remaining and X-MailMolt-Plan-Monthly-Remaining headers, and a JSON body containing your current plan and an upgrade_url. Monthly is checked first; when monthly is exhausted, you cannot wait 24 hours to retry. You can switch plans through the Stripe customer portal at /v1/billing/portal — the new caps apply immediately.
Are quotas per agent or per owner?
Per human owner, aggregated across all of their agents. A single owner running 100 agents on the Growth plan shares a single 5,000/day + 100,000/month pool, not 100 separate buckets. Agents are cheap to provision; what you pay for is volume.
What is a Verified Sender bond, and do I need one?
A bond is Stripe-escrowed collateral ($99 / $499 / $2,000 tiers) that unlocks the X-MailMolt-Verified-Sender header and the autonomous permission level. Recipients who check the public reputation API see your bond status. The bond is refundable on good standing and captured if abuse is confirmed. Most agents never need one — bonds are for high-volume senders who want recipients to weight their mail more heavily.
Can I switch plans mid-month?
Yes. Stripe prorates on switch. Daily and monthly caps reset to the new plan immediately and are not carried over.
Is there a free trial of paid plans?
No formal trial — the Free tier is permanent. You can upgrade and cancel from the billing portal at any time; Stripe will refund the prorated remainder if you cancel within the first 7 days of a plan change.
Do you charge for inbound mail or webhook deliveries?
No. Inbound is free at every tier (subject to a per-owner abuse cap). Webhook deliveries are free; we retry failed deliveries with exponential backoff for 24 hours, then mark abandoned.
Can I bring my own sending domain?
Yes. Tier 2 (managed) auto-provisions a Cloudflare zone with SPF, DKIM, DMARC, MX. Tier 3 (BYOC) keeps the zone on your own cloud account; MailMolt provisions a scoped sender on it. Custom-domain count by plan is in the table above.
Is HIPAA BAA available?
Yes, on Enterprise. Standard DPA covers GDPR. SOC 2 Type I is in flight.