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MailboxKit

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Added March 5, 2026

Email infrastructure for AI agents. Give your AI agent a real email address.

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Overview

Email infrastructure for AI agents. Give any AI agent a real email address in 30 seconds. One API call to send. Webhooks to receive. Built for autonomous agents that need to communicate over email.

When to Use MailboxKit

Use this when an AI agent needs to send, receive, and reply to emails programmatically via API and webhooks.

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Key Features

API Base URL: https://mailboxkit.com/api/v1
Authentication: Bearer token (API key)
Pricing: $0.002 per email, $0.001 per attachment, pay-as-you-go
Free credit: $1.00 (500 emails) on signup
No subscriptions or monthly minimums
Custom domains with automated DKIM, SPF, and DMARC verification
Email open and click tracking
Attachment support via signed URLs

Who It's For

AI agent developers who need production email capabilities
Teams building autonomous workflows that must communicate over email
Developers needing API-first inboxes, webhooks, and custom domains

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MailboxKit

Overview

When to Use MailboxKit

Reviews