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agentbox.id

Overview / Description

Agentbox.id is an AI automation tool that provides dedicated IMAP/SMTP email mailboxes for AI agents and agentic frameworks. Developers and AI builders who run automated agent workflows need a reliable way for those agents to send and receive email without sharing personal inboxes or configuring complex mail servers. Agentbox.id solves this by instantly generating a unique mailbox address and credentials — including IMAP host, SMTP host, username, and password — that can be pasted directly into any agent framework.

The service works with popular agent orchestration tools including n8n, LangGraph, CrewAI, Mastra, Hermes, and OpenClaw, as well as any framework that speaks standard IMAP and SMTP protocols. Registration uses your personal email; first-time users receive a randomly generated mailbox, while returning users retrieve their previously configured credentials immediately.

Current constraints are clearly documented: the service is free with one agent mailbox per registered user, a 100 MB storage cap, and read mail deleted after 30 minutes to conserve space. Outbound email is rate-limited to 50 messages per hour per mailbox. Inbound communication is currently restricted to 1-on-1 exchanges with the registered email address, with whitelist support planned for a future release.

Agentbox.id is aimed at solo developers, AI researchers, and small teams who are building or testing agentic pipelines and need a frictionless email endpoint for their agents without managing a full mail server setup.

Used For

Agentbox.id is used by developers and AI builders to provision dedicated email accounts for AI agents running inside automation frameworks like n8n, CrewAI, LangGraph, or Mastra. It is particularly suited for prototyping and small-scale agentic pipelines that require email send/receive capabilities without a custom mail server.

Pricing

Free

$0/month

$0 — one agent mailbox per user, 100 MB storage, 50 outbound messages/hour

View pricing

Pros & Cons

Pros

  • Completely free with no payment required — one mailbox per registered user
  • Instant mailbox provisioning with ready-to-paste IMAP/SMTP credentials
  • Compatible with any agent framework that speaks standard IMAP and SMTP protocols
  • Works out of the box with popular orchestration tools including n8n, CrewAI, LangGraph, and Mastra
  • Clearly documented constraints (storage cap, rate limits, inbound rules) so developers know exactly what to expect

Cons

  • Limited to one agent mailbox per human user account — no multi-mailbox support yet
  • Inbound email is currently restricted to 1-on-1 communication with the registered email; no whitelist for third-party senders yet
  • 100 MB storage cap with aggressive 30-minute deletion of read mail may not suit high-volume pipelines
  • Outbound rate limit of 50 messages per hour may be a bottleneck for high-frequency agent workflows

Questions & Answers

Alternatives

Mailgun, SendGrid, Postmark, Resend

agentbox.id | AI Tools Directory