5 email tools you can use instead of MepMail. Summaries come from each vendor's own site. Links checked Oct 27, 2026.
Email for apps and AI agents: a Resend-compatible sending API with SMTP, plus mailboxes on your own domain that agents read and draft in over MCP, where you choose direct sending or approval for each reply. AGPL open source and self-hostable.
At a glance
| Tool | What it does | Open source | Head to head |
|---|---|---|---|
| AgentMail | Email inbox API for agents: create, send, and receive real inboxes. | No | MepMail vs AgentMail |
| MachineMail | Email API for AI agents: free inboxes on a shared domain or your own, a trust report on every inbound message, a REST API that follows AgentMail's paths and field names, webhooks and an MCP server. | No | MepMail vs MachineMail |
| Mailgun | Email API to send, receive, and track email. | No | MepMail vs Mailgun |
| Resend | Developer email API for transactional and marketing mail. | No | MepMail vs Resend |
| Shipmail | Business email hosting with an API for agents: custom-domain mailboxes agents can send from and read, webhooks, TypeScript and Python SDKs, a CLI and an MCP server. | No | MepMail vs Shipmail |
Email inbox API for agents: create, send, and receive real inboxes.
Email API for AI agents: free inboxes on a shared domain or your own, a trust report on every inbound message, a REST API that follows AgentMail's paths and field names, webhooks and an MCP server.
Email API to send, receive, and track email.
Developer email API for transactional and marketing mail.
Business email hosting with an API for agents: custom-domain mailboxes agents can send from and read, webhooks, TypeScript and Python SDKs, a CLI and an MCP server.
FAQ
Agent Stack Directory lists 5 other email tools: AgentMail, MachineMail, Mailgun, Resend, Shipmail.
None of the other email tools we list is marked open source.
Email for apps and AI agents: a Resend-compatible sending API with SMTP, plus mailboxes on your own domain that agents read and draft in over MCP, where you choose direct sending or approval for each reply. AGPL open source and self-hostable. (Summary based on mepmail.dev, link checked 2026-10-27.)