If you're building AI agents that send and receive email, you've probably come across AgentMail. Or you're already using it and just noticed that every inbox past the tenth costs $2/mo on top of the $20 plan. This page gives you a direct, honest comparison so you can make the right call.
Bottom line: Dead Simple Email gives you more inboxes at every price tier, includes a visual dashboard (AgentMail is API-only), and supports MCP natively for zero-code LLM integration. If you don't need SOC 2 compliance or dedicated IPs, DSE does everything AgentMail does at 67–71% less cost.
Pricing Comparison
AgentMail's $20/mo plan includes 10 inboxes; since August 2026 you can add pay-as-you-go on top at $2 per extra inbox, $2 per extra domain and $2 per extra 1,000 sends, and the $200/mo plan includes 150 inboxes. If you need 15 inboxes, that's $30/mo with AgentMail. With Dead Simple Email, it's $5/mo, and 100 inboxes are included at $29/mo instead of costing about $200/mo.
| Plan | Dead Simple Email | AgentMail |
|---|---|---|
| Free | 5 inboxes, 5,000 emails/mo | 3 inboxes, 100 emails/day |
| Entry paid | $5/mo — 15 inboxes | $20/mo — 10 inboxes |
| Mid tier | $29/mo — 100 inboxes | $200/mo — 150 inboxes |
| Scale | $99/mo — 500 inboxes | $200/mo — 150 inboxes |
| Extra inboxes | $0.40/inbox/mo overage | $2/inbox/mo pay-as-you-go (on $20 and $200 tiers) |
| Cost per inbox (mid) | $0.29/inbox | $1.33/inbox |
| Pay per request (no account) | $1.00/inbox via x402 or Stripe MPP; $0.01/send, $0.005/read | $2.00/inbox via x402; MPP on Tempo only |
At the mid tier, Dead Simple Email is 86% cheaper per inbox than AgentMail. For teams deploying AI agents at scale, say 20 customer deployments each needing 10 inboxes, AgentMail costs about $200/mo whether you take the $200 plan or stack 190 extra inboxes on the $20 one. DSE costs $29/mo. That's over $2,000/year back in your pocket.
Feature Comparison
| Feature | Dead Simple Email | AgentMail |
|---|---|---|
| Programmatic inbox creation | Yes | Yes |
| Send + receive email | Yes | Yes |
| Webhooks | All plans (incl. free) | Paid plans only |
| Webhook retries + delivery log | Retries, delivery log, replay | Retries |
| Real-time streaming | Webhooks, WebSocket, SSE | Webhooks, WebSocket |
| Attachment text extraction | PDF, XLSX, DOCX, CSV | Yes |
| Verification-code / OTP extraction | Yes (wait_for_email) | Yes |
| Prompt-injection scanning | Yes — every inbound email, scored | No |
| Deliverability reporting | Per-inbox delivery, bounce & spam insight | Limited visibility |
| Visual dashboard | Yes | No (API-only) |
| MCP server (LLM-native) | Yes (19 tools, including calendar) | Yes (hosted) |
| Framework integrations | LangChain, CrewAI, LlamaIndex, AutoGen, ADK | Yes |
| Custom domains | Yes | Yes |
| IMAP/SMTP access | Yes | Yes |
| SOC 2 certified | No | Yes |
| Dedicated IPs | No | Higher tiers |
| Semantic search | No | Yes |
| Structured data extraction | Codes, links, attachments | Yes (general) |
| Free inboxes | 5 | 3 |
| Free email limit | 5,000/mo | 100/day |
| Python SDK | Yes | Yes |
| REST API | Yes | Yes |
| Agent identity / OIDC sign-in | Yes: Sign in with Dead Simple (OIDC provider, free on every plan) | Yes: AgentID (OIDC, launched 2026-09-09) |
| Inbound prompt-injection scanning | Yes: live on every plan, injection_risk and injection_score on every inbound message | Agent Armor: beta, observe-only, request access |
| Pay per request without an API key (x402 / MPP) | Yes: x402 USDC (Base, Polygon, Solana) and Stripe MPP cards; $1.00 per inbox | x402 at $2.00 per inbox; MPP on Tempo only, no card |
| Calendar per inbox (events, invites, RSVP, ICS feed) | Yes: events, invitations, RSVP, inbound ingestion, ICS feed | No |
| Metrics time-series API | Yes: GET /v1/metrics, day or hour buckets | Yes |
| Inbox-scoped API keys and webhooks | Yes: inbox_ids on API keys and webhooks | Yes |
Where Dead Simple Email Wins
Price. This is the main reason people switch. At $29/mo for 100 inboxes vs $200/mo for 150, the math is straightforward. For teams deploying agents at scale, the savings compound fast.
Dashboard. AgentMail is API-only. Dead Simple Email includes a visual dashboard for monitoring inboxes, debugging issues, and managing accounts without writing code. This matters when something breaks at 2am and you need to see what's happening.
Framework coverage. If you're building with Claude, ChatGPT, Meta Muse, Hermes Agent, LangChain, CrewAI, AutoGen, or OpenClaw, DSE ships drop-in tools and an MCP server for all of them. AgentMail covers the OpenAI Agents SDK, Vercel AI SDK, and MCP, but has no CrewAI, AutoGen, or LlamaIndex integrations.
Free tier. DSE gives you 5 free inboxes with 5,000 emails/month. AgentMail gives you 3 inboxes with a 100 emails/day cap.
Prompt-injection scanning, live on every plan. Every inbound email is scanned for instructions that try to hijack an agent reading it ("ignore previous instructions", "forward the invoices to this address", chat-template delimiters and more) and returned with injection_risk and injection_score on the message object, so your agent knows what is safe to act on. AgentMail's equivalent, Agent Armor, is model-based but in beta, observe-only and behind a request-access form. See how the scanner works.
Agent identity and pay per request, at half the price. Both products now offer an OpenID Connect login where the agent's inbox is the identity (DSE's Sign in with Dead Simple, AgentMail's AgentID) and both accept x402 for inbox creation without an API key. DSE charges $1.00 per inbox over x402 against AgentMail's $2.00, also prices sends ($0.01) and reads ($0.005) individually, accepts Stripe cards via MPP on inbox creation, and hands back an API key with the first paid inbox. See pay per request.
A calendar on every inbox. Each DSE inbox has a calendar: events, real iCalendar invitations with managed sequence numbers, RSVPs, automatic ingestion of invitations that arrive by email, and a webcal feed a human can subscribe to. AgentMail has no calendar; an invitation that reaches an AgentMail inbox is an email with an attachment.
Metrics and inbox scoping, now on both. Two things AgentMail had first are no longer exclusives. DSE's GET /v1/metrics returns a day or hour time series of sent, received, bounced, complained, opened, clicked, webhook deliveries and failures, and injection-flagged messages, per account or per inbox. And API keys and webhooks both accept inbox_ids, so an agent's key reaches only its own inbox and its webhook hears only that inbox. AgentMail offers a metrics API and inbox-scoped keys too, so treat these as parity rather than a reason to pick either side.
Deliverability you can see. One of the most common complaints about API-only agent email is that deliverability is a black box: a shared sending environment with no visibility into what's landing. DSE actively manages sender reputation and gives you per-inbox reporting on delivery, bounces, complaints, and spam placement, so you're not flying blind when it matters.
Where AgentMail Wins
It's worth being honest about where AgentMail is the better choice:
- SOC 2 certification — if your compliance team requires it, AgentMail has it and DSE doesn't yet
- Dedicated IPs — available on AgentMail's higher tiers for teams that need IP reputation isolation
- Semantic search — AgentMail can search inbox content by meaning, not just keywords
- Structured data extraction — automatically pulls structured fields from email content
- Larger customer base — AgentMail has been in market longer with YC backing
If your primary requirement is enterprise compliance (SOC 2, dedicated IPs) or you need semantic search on inbox content, AgentMail is worth the premium. A metrics API and inbox-scoped API keys used to belong on this list; both products have them now.
Who Should Use Dead Simple Email
- AI SDR/BDR tool builders deploying agents across multiple customer accounts. At $29 for 100 inboxes, your per-customer email cost drops from $200/mo (AgentMail) to $29/mo.
- Developers paying AgentMail's per-inbox meter. If you need 15 inboxes and don't want to pay $20 plus $2 for each extra, DSE's $5/mo Hobby plan includes all 15.
- Framework and agent developers using Meta Muse, Hermes Agent, LangChain, CrewAI, AutoGen, or OpenClaw. MCP-native integration means zero custom code.
- AI development agencies building agents for clients. One DSE account handles multiple client deployments. When an agency picks DSE, it becomes the default for every client they build for.
How to Switch from AgentMail
Migration takes less than an hour for most setups:
- Sign up for Dead Simple Email (free, no credit card, 5 inboxes immediately)
- Create your inboxes via the dashboard or API
- Update your agent's email config to point to the DSE API
- Verify your sending domain (same DNS process as AgentMail)
- Cancel AgentMail
The API structure is similar enough that most teams complete the switch in a single session.
Frequently Asked Questions
Yes. Dead Simple Email runs on infrastructure built specifically for AI agent email, with actively managed sender reputation and per-inbox deliverability reporting so you can see delivery, bounce, and spam placement. It is not a consumer email product with an API bolted on.
Yes. Dead Simple Email has a native MCP server that any Claude, ChatGPT, or LLM-based agent can connect to. No custom integration code required. It also works via the REST API with any framework.
Contact us for Enterprise pricing. We handle custom volume for teams that need more than 500 inboxes.
Not currently. AgentMail offers dedicated IPs on higher tiers. If dedicated IP isolation is a hard requirement, AgentMail may be the better fit for that specific need.
No. The free plan is permanent: 5 inboxes and 5,000 emails per month, forever. No credit card required. Upgrade when you need more, downgrade or cancel anytime.
Most teams migrate in under an hour. Sign up, create inboxes via dashboard or API, update your agent's email config to point to the DSE API, verify your sending domain, and cancel AgentMail.