OpenMail (openmail.sh) is an EU-based email API for AI agents: programmatic inboxes, a free tier, and a straightforward Pro plan that grows by the inbox. It's a sensible product with honest pricing — which we respect, because it's the same philosophy we run on. The real differences show up in three places: how much you get free, what happens to the price as you scale, and how much tooling exists around the API. This page compares both, using OpenMail's published details as of August 2026.
Bottom line: Dead Simple Email gives you more from the first minute — 5 free inboxes and 5,000 emails/mo versus OpenMail's 3 and 3,000 — and stays flat as you grow: $29/mo covers 100 inboxes, where OpenMail's €1-per-inbox model works out to roughly €99/mo for the same count. On top of that, DSE ships a visual dashboard, an MCP server plus five framework integrations, prompt-injection scanning on every inbound email, and automatic verification-code extraction. If you specifically want an EU vendor and run a small, stable fleet, OpenMail is a fine choice.
Pricing Comparison
As of August 2026, OpenMail's free plan is 3 inboxes and 3,000 emails/mo. Pro is €9/mo for 10 inboxes and 10,000 emails, then €1 per additional inbox. That model is easy to reason about at small counts and gets linear-expensive at larger ones.
| Plan | Dead Simple Email | OpenMail (Aug 2026) |
|---|---|---|
| Free | 5 inboxes, 5,000 emails/mo | 3 inboxes, 3,000 emails/mo |
| Entry paid | $5/mo — 15 inboxes, 15,000 emails | €9/mo Pro — 10 inboxes, 10,000 emails |
| 30 inboxes | $29/mo (Pro tier covers up to 100) | ~€29/mo (€9 + 20 × €1) |
| 100 inboxes | $29/mo flat — 100 inboxes, 100,000 emails | ~€99/mo (€9 + 90 × €1) |
| 500 inboxes | $99/mo flat | ~€499/mo at €1/inbox |
| Overage model | None — flat tiers | €1 per inbox above 10 |
Around 30 inboxes the two are roughly at parity. Below that, OpenMail's €9 entry is slightly cheaper than nothing only if you need more than DSE's free 5 inboxes but fewer than 10; above it, the per-inbox euro keeps climbing while DSE's tiers stay flat. At 100 inboxes the gap is roughly 3x.
Feature Comparison
| Feature | Dead Simple Email | OpenMail (Aug 2026) |
|---|---|---|
| Built for AI agents | Yes | Yes |
| Free inboxes | 5 (5,000 emails/mo) | 3 (3,000 emails/mo) |
| Programmatic inbox creation | Yes | Yes |
| Visual dashboard | Yes (all plans) | Not an advertised feature |
| MCP server | Yes — in the official MCP registry | Not an advertised feature |
| Framework integrations | LangChain, CrewAI, AutoGen, LlamaIndex, Vercel AI SDK | REST API |
| Prompt-injection scanning | Yes — every inbound email, scored | Not an advertised feature |
| Verification-code / OTP extraction | Yes (agents self-onboard) | Not an advertised feature |
| Webhooks + streaming | Webhooks, WebSocket, SSE — all plans | Webhooks |
| IMAP/SMTP access | Yes — every inbox | API access |
| Vendor location | US | EU |
| Pricing model | Flat published tiers ($0/$5/$29/$99) | Free + €9 Pro + €1/inbox |
Where Dead Simple Email Wins
A bigger free tier. 5 inboxes and 5,000 emails/mo without a credit card, versus 3 and 3,000. If you're prototyping a multi-agent system, two extra free inboxes is often the difference between testing the real design and testing a cut-down one.
Flat pricing at scale. $29/mo covers 100 inboxes and 100,000 emails. Per-inbox pricing like OpenMail's is transparent, but it makes every new agent a billing decision. Flat tiers make scaling from 20 agents to 90 a non-event.
A visual dashboard. Every inbox, message, webhook delivery, and API key visible in a real UI on all plans. When an agent misbehaves at 2am, you want to look at its inbox, not write a debugging script.
MCP + framework integrations. DSE ships an MCP server listed in the official MCP registry, plus maintained integrations for LangChain, CrewAI, AutoGen, LlamaIndex, and the Vercel AI SDK. Your agent framework almost certainly has a first-class path in.
Security built for agents. Every inbound email is scanned for prompt-injection attempts and scored before your agent acts on it, and verification codes, OTPs, and magic links are auto-extracted so agents can self-onboard to third-party services.
Where OpenMail Wins
OpenMail is a legitimate product with a model we'd call fair. It's the better choice when:
- You want an EU vendor. OpenMail is EU-based. For European teams whose compliance or procurement posture prefers an EU-domiciled provider, that's a genuine advantage DSE doesn't offer.
- Your inbox count is small and stable. Between 10 and roughly 30 inboxes, €9 + €1/inbox is competitive and easy to budget.
- You only need a clean REST API. If you're not using MCP or an agent framework and don't want a dashboard, OpenMail's smaller surface may be all you need.
Who Should Use Dead Simple Email
- Teams that expect to grow. Flat tiers mean inbox #90 costs the same as inbox #11: nothing extra.
- MCP and framework users. Claude, Cursor, LangChain, CrewAI, AutoGen, LlamaIndex, Vercel AI — all first-class.
- Agents that self-onboard. Automatic OTP and magic-link extraction removes the human from signup loops.
- Security-conscious builders. Injection scanning on every inbound email matters when agents act autonomously.
- Anyone who wants to see their agents' email. The dashboard is included on every plan, free included.
How to Switch from OpenMail
- Sign up for Dead Simple Email — free, no credit card, 5 inboxes immediately.
- Create an inbox per agent via the dashboard or API.
- Repoint your webhooks and swap the API client — or connect the MCP server instead.
- Verify your sending domain — DSE guides the MX/SPF/DKIM/DMARC records.
- Wind down the OpenMail inboxes once traffic is flowing through DSE.
Frequently Asked Questions
Dead Simple Email is a direct alternative to OpenMail for AI agent email. Its free tier is larger (5 inboxes and 5,000 emails per month vs OpenMail's 3 inboxes and 3,000 emails as of August 2026), and it adds a visual dashboard, an MCP server plus framework integrations for LangChain, CrewAI, AutoGen, LlamaIndex, and the Vercel AI SDK, prompt-injection scanning, and automatic verification-code extraction.
As of August 2026, OpenMail's free plan includes 3 inboxes and 3,000 emails per month, and its Pro plan is €9/mo for 10 inboxes and 10,000 emails, then €1 per additional inbox. Dead Simple Email's free plan includes 5 inboxes and 5,000 emails per month; paid tiers are $5/mo for 15 inboxes and $29/mo for 100 inboxes — at 100 inboxes, OpenMail's per-inbox model works out to roughly €99/mo versus DSE's flat $29/mo.
MCP support is not an advertised OpenMail feature as of August 2026. Dead Simple Email ships an MCP server listed in the official MCP registry, so agents in Claude, Cursor, and other MCP-compatible tools can use email natively, plus maintained integrations for LangChain, CrewAI, AutoGen, LlamaIndex, and the Vercel AI SDK.
OpenMail is EU-based, which can simplify things for European teams that want an EU vendor, and its €1-per-additional-inbox model is easy to reason about between 10 and roughly 30 inboxes. If you are an EU team with a small, stable inbox count and no need for MCP or a dashboard, OpenMail is a reasonable choice.
Yes. Dead Simple Email automatically extracts verification codes, OTPs, and magic links from inbound email so agents can sign up for services and complete confirmations without a human in the loop. It also scans every inbound email for prompt-injection attempts and returns a risk score on the message object.