- Processed emails/mo1,000
- Inboxes5
- Daily limit250
- Custom domains0 (mailbot.id only)
- Attachment size5 MB
- Webhook endpoints2
- Data retention3 days
- Engagement trackingDelivered only
- Audit log—
- Compliance—
- SupportDocs + email support
Pricing
The execution and observability layer for agent email
Start free on the sandbox. Go to production when your workflow is ready. Billing metric: processed emails (sent + received).
Most popular
- Processed emails/mo10,000
- Inboxes25
- Daily limit1,000
- Custom domains3
- Attachment size10 MB
- Webhook endpoints10
- Data retention14 days
- Engagement trackingFull (open/click/bounce)
- Audit log30 days
- ComplianceSPF/DKIM + DMARC
- Supportmailbot inbox (48h SLA)
Growth
$149/mo
Scale with advanced observability and compliance. Need more? Contact us.
Upgrade to Growth- Processed emails/mo100,000
- Inboxes100
- Daily limit5,000
- Custom domains10
- Attachment size25 MB
- Webhook endpoints20
- Data retention45 days
- Engagement trackingFull + badges + timeline
- Audit log90 days
- Compliance+ compliance dashboard
- SupportPriority inbox (12h SLA)
Webhook Reliability Add-on
Other email APIs send webhooks. mailbot delivers them.
7-day free trial. Separate subscription.
Sandbox
+$5/mo
2 endpoints · 1K emails
Builder
+$12/mo
10 endpoints · 10K emails
Growth
+$29/mo
20 endpoints · 100K emails
DLQ dashboard
Auto-retry 7x
One-click replay
Webhook delivery stats
Included in every plan
API + SDK access (Node.js, Python)
MCP Server (16 tools)
Dashboard + Console
SPF/DKIM authentication
Thread-aware inbox model
Webhook event delivery
Frequently asked questions
What counts as a processed email?
Every email sent or received through mailbot counts as one processed email. Inbound has real cost (MIME parsing, webhook delivery), so we bill honestly for both directions.
What happens when I hit my email limit?
Sending stops until the next billing cycle. You get a clear 429 error with your current usage and limit. Upgrade anytime to increase your limit right away.
Can I start on Sandbox and upgrade later?
Yes. Sandbox is free forever. When you need custom domains or higher volume, upgrade to Builder with one click. No data migration, no downtime.
What is the primary paywall?
Custom domains. Sandbox uses mailbot.id only. When your agent needs agent@yourcompany.com, upgrade to Builder ($29/mo, 3 domains).
Do you offer annual billing?
Yes. Annual billing saves 20%. Builder drops to $23/mo effective, Growth to $119/mo effective.
How does support work?
Sandbox gets docs and email support. Paid plans get a dedicated mailbot inbox for support — your agent or you can email directly. Builder: 48h SLA. Growth: 12h priority.
What about rate limits?
API rate limits (req/min) are documented in /docs as fair-use guardrails, separate from the daily send limits shown above. They exist to protect infrastructure, not to gate features.
Your first inbox is a short setup away
No credit card. No domain setup. Send your first email, see delivery proof, then upgrade when you are ready.
Start for free