kitio.aiAgentMail vs Postfleet
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Postfleet has the lower starting price: about $7 a month, against $20 for AgentMail.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Inboxes created by API
- Threaded send and receive
- Attachments
- Webhooks and events
- Custom domains
- Per-agent permissions
- Agent mailboxes
- Prompt injection screening
- Schema-based extraction
- Email classification
- REST and MCP access
| Feature | AgentMail | Postfleet |
|---|---|---|
| Best for | Email inbox API that gives AI agents their own addresses | Email inboxes for AI agents with prompt-injection screening |
| Category | Agents & automation | Agents & automation |
| Pricing model | Freemium | Freemium |
| Starting price | $20/mo | $7/mo |
| Free plan | Yes | Yes |
| Made by | AgentMail | Postfleet |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Postfleet has the lower starting price: about $7 a month, against $20 for AgentMail.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Free
Free
- 3 inboxes
- 3,000 emails a month
- 1 custom domain
- 3 GB storage
Developer
$20/mo
- 10 inboxes
- 10,000 emails a month
- 10 custom domains
- Email support
Startup
$200/mo
- 150 inboxes
- 150 custom domains
- 10 organization seats
- SOC 2 report
Enterprise
Contact sales
- Bring-your-own-cloud deployment
- Dedicated IPs
- OIDC and SAML SSO
4 plans
Free
Free
- 100 messages to JSON per month
- 3 mailboxes
- 3,000 sends per month
Starter
$7/mo
- 250 messages to JSON per month
- 5 mailboxes
- Email support
Pro
$20/mo
- 1,500 messages to JSON per month
- 10 mailboxes
- Custom sending domains
Scale
$200/mo
- 25,000+ messages to JSON
- 150 mailboxes
- Multiple custom domains
Prices in USD, checked Nov 5, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
AgentMail
- Free tier with three inboxes
- Python and TypeScript SDKs plus MCP
- Custom domains with DKIM, SPF and DMARC
- Free plan capped at 100 emails a day
- SOC 2 report only on Startup and up
- Dedicated IPs require Enterprise
Postfleet
- Free tier with no card
- Strips hidden content before the model
- Typed JSON output
- Model checks capped by monthly limits
- Aimed at developers only
- Custom domains start on Pro
Which one should you choose?
Choose AgentMail if you want:
- Free tier with three inboxes
- Python and TypeScript SDKs plus MCP
- Custom domains with DKIM, SPF and DMARC
Watch out: free plan capped at 100 emails a day.
Choose Postfleet if you want:
- Free tier with no card
- Strips hidden content before the model
- Typed JSON output
Watch out: model checks capped by monthly limits.
AgentMail vs Postfleet FAQ
What is the difference between AgentMail and Postfleet?
AgentMail: Email inbox API that gives AI agents their own addresses. Postfleet: Email inboxes for AI agents with prompt-injection screening. Both are agents & automation tools.
Is AgentMail or Postfleet cheaper?
Postfleet has the lower starting price: about $7 a month, against $20 for AgentMail.
Do AgentMail and Postfleet have free plans?
AgentMail: Yes. Postfleet: Yes.
Who makes AgentMail?
AgentMail is made by AgentMail.
Who makes Postfleet?
Postfleet is made by Postfleet.
Which should I choose, AgentMail or Postfleet?
Choose AgentMail if you value free tier with three inboxes and python and typescript sdks plus mcp. Choose Postfleet if you value free tier with no card and strips hidden content before the model.