Comparison

GigaMail and AgentMail solve different problems.

AgentMail gives an AI agent its own new inbox, hosted in its cloud and driven by an API. GigaMail connects an agent to the mailbox you already use, from your computer, and keeps sending, replying and deleting behind your approval.

Which one fits

Pick AgentMail if

your agent needs addresses of its own, created by code, on agentmail.to or your domain;
you build a product that sends and receives at scale through an API, with webhooks;
a hosted service in the United States (or the EU on Enterprise) is fine for that mail.

Pick GigaMail if

the agent should work on your mail: Microsoft 365, Outlook, Gmail or any IMAP server;
mail, index and credentials should stay on your computer;
nothing should leave until a person approves it, outside the agent’s reach.

Side by side

	GigaMail	AgentMail
What it is	Local app, CLI and MCP server that connects an agent to your existing mailbox.	Hosted API that creates new email inboxes for agents.
Your existing mailbox	Yes: Microsoft 365 and Outlook.com through Microsoft Graph, any IMAP server (Gmail, Aruba, Libero…).	Not offered: it creates new inboxes on `@agentmail.to` or on your custom domain.
Where mail lives	On your computer. GigaMail runs no servers and receives nothing.	In AgentMail’s cloud: United States; an EU region on the Enterprise plan.
Source code	Open source, AGPL-3.0, the whole product.	Closed service; SDKs, CLI and MCP bridge are open source (MIT).
Self-hosting	It runs on your machine by design.	Not offered; “BYO cloud deployment” is listed on Enterprise.
Price	Free.	Free: 3 inboxes, 3,000 emails a month. Developer $20/month, Startup $200/month, Enterprise on request.
MCP server	Local, over stdio, 30 tools, no network port.	Hosted over HTTP, 47 tools, OAuth or API key.
Before a send	Every send, reply, move or delete waits for a person’s approval out of band (Windows Hello / Touch ID). The agent cannot approve.	The agent sends through the API. For human review, the docs suggest drafts plus API keys without send permission, which you configure.
Prompt injection	Mail reaches the agent as visible text only; hidden text is left out and flagged. Logins and setup are CLI only.	Agent Armor (in Labs, US only) gives inbound mail a clear or review verdict, described as advisory.
Sensitive data	In the console, the masker hides tax codes, VAT numbers, IBANs and phone numbers before a mail goes to the agent for a draft, and puts them back in the draft. The same filter on the MCP side is planned.	No masking or redaction feature found in the docs.
Built for	People and teams who want an agent to help with their own mail.	Developers building agents and products that need email of their own.

See the MCP map

Sources

AgentMail facts come from its own pages, read on 4 November 2026: agentmail.to, pricing, docs, the MCP, human-in-the-loop, Agent Armor and security pages, and github.com/agentmail-to. Prices and limits change: check their site. AgentMail is a trademark of its owner; this page is not affiliated with it. If something here is out of date, write to founder@adecubed.com and we will fix it.