mxu.io vs AgentMail: platform or utility?
Both give AI agents email. The honest difference: AgentMail is a platform — semantic search across inboxes, prompt-based auto-labeling, custom domains, enterprise features, backed by $6M in funding. mxu.io is a utility — the shortest path from "my agent needs an inbox" or "my test needs to read an OTP" to done, at a flat price. Plenty of teams should pick AgentMail. Here's how to tell which one you are.
Side by side
| mxu.io | AgentMail | |
|---|---|---|
| Positioning | Lightweight utility for agents & test suites | Full email platform for agent products |
| Pricing model | Flat: $0 / $9 / $29 / $99 per month | Free tier (3 inboxes), then $20/mo Developer, $200/mo Startup |
| Interface | MCP-first remote server + plain REST (curl works day one) | API + SDKs (Python, TypeScript), webhooks |
| OTP / link handling | Deterministic extraction on every message (extracted.otp, extracted.verify_link) — exact, instant, no AI cost | AI features: semantic search, auto-labeling |
| Blocking receive | wait_for_message long-poll built for agent loops and CI | Webhook/event driven |
| Retention | Ephemeral by design: 48h free, 30–365 days paid | Storage-oriented (GB quotas) |
| Custom domains | Not yet | Yes |
| Semantic search | No — your agent already has a brain | Yes |
| Best for | CI email assertions, agent tutorials/demos, OTP flows, hobby & indie agents | Production agent products with heavy email workloads and teams |
Choose AgentMail if…
- Email is your product — an AI SDR, a support agent living in a shared inbox.
- You need custom domains, long-term storage, and search across large mail history.
- You want a funded vendor with SLAs and a roadmap of platform features.
Choose mxu.io if…
- You need email assertions in Playwright/Cypress/CI — inbox-per-test-run, read
extracted.otp, done. - Your agent needs to receive and act — verification mails, human replies, system notifications — without a mail-platform bill.
- You want the MCP one-liner: one config entry and Claude (or any MCP agent) has
create_inboxandwait_for_message. - You prefer flat pricing and a deliberately small, predictable surface.
The philosophical difference
AgentMail adds intelligence to the inbox. We think the intelligence is already on your side of the API — what agents and tests actually lack is structure and timing. So mxu invests in deterministic extraction and blocking primitives instead of AI features, keeps retention short by default (which also protects the shared domain from abuse), and keeps sending behind strict guardrails so deliverability stays clean for everyone.
Try mxu free