Postfleet

Postfleet is email infrastructure for AI agents. Every inbound message is parsed, classified, and extracted to your JSON schema, and screened for prompt injection before your agent reads a word. Hidden text, zero-width characters, and homoglyphs are stripped, and every removal is logged in a sanitization report you can read.

Your agent gets JSON, or it gets nothing. Flagged mail is delivered deterministic-only and fails closed, never as trusted content.

Connect over MCP: use the hosted endpoint from any MCP client, or run the local npx package. Tools include create_mailbox, send_email, reply_email, list_inbox, read_email, and wait_for_email. Agents can sign themselves up over MCP.

Pricing: the Free plan is $0/mo with no card and includes 100 comprehended messages per month, 3 mailboxes, and 3,000 sends per month. Paid plans are Starter at $7/mo, Pro at $20/mo, and Scale at $200/mo, with higher message, mailbox, and send limits. Sanitization runs on every message on every tier.