Postfleet
Email infrastructure for AI agents. Inbound is parsed, classified, extracted to your schema — and screened for prompt injection — before your agent reads a word.
Plans and what they include
- 3 mailboxes
- 3,000 sends / month
- Up to 100 sends / day; new-recipient limits apply
- Unlimited hidden-content sanitization
- REST + MCP (hosted and local npx)
- Everything in Free
- 5 mailboxes
- 5,000 sends / month
- Email support
- Everything in Free
- 10 mailboxes
- 10,000 sends / month
- Custom sending domains
- Email support
- Everything in Pro
- 150 mailboxes
- 150,000 sends / month
- Multiple custom domains
- Priority support + shared Slack
- Annual billing available
Read from their site on 24 Oct 2026 — the monthly figure where a plan is shown both ways. Verify on the site before buying.
About Postfleet
Raw email is attacker-controlled input. Hidden text, zero-width characters, HTML your parser trusts and your model obeys — piped straight into your agent's context, with its tool access and its credentials. An inbox API needs explicit controls for what reaches the model and which actions the agent can take.
An inbox for an agent isn't a pipe. It's a trust boundary. See how that differs from an inbox API feature by feature, or start with how to build an AI email agent. Compare inbox models in our best email APIs for AI agents guide.
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24 Oct 2026Listing refreshed from the product site price 7 USD/month, plans 4, logo 180→180 px, category (rules)
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24 Oct 2026Listing refreshed from the product site price 7 USD/month, logo 180→180 px, category (rules), description (site text)
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22 Oct 2026The page content changed
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20 Oct 2026The page content changed
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7 Oct 2026The page content changed
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2 Oct 2026The page content changed
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30 Sep 2026Listing refreshed from the product site price 20 USD/month, category (rules)
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28 Sep 2026Listing refreshed from the product site price 20 USD/month, category (rules)
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28 Sep 2026Listing refreshed from the product site price 20 USD/month, category (rules)
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27 Sep 2026Listing refreshed from the product site price 20 USD/month, tags
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19 Sep 2026The page content changed
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17 Sep 2026Listing refreshed from the product site price 20 USD/month, contact, category (rules), description (site text)
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12 Sep 2026Added to the catalog from public information — unclaimed
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