LobsterMail (lobstermail.ai) built the right idea: an agent calls one function and gets an address, with no human in the setup loop and no API key to paste. It scans inbound mail across six injection categories and exposes a safeBodyForLLM() helper, which is exactly the right ergonomic. Dead Simple Email agrees with all of it — we scan every inbound message too, and agents can provision inboxes with nothing but a wallet.
Bottom line: the difference is the price ladder. LobsterMail's paid plans are $9 for 10 inboxes and $99 for 300, with no step between them, so a fleet of 40 agents pays the $99 price. Dead Simple Email's $29 Pro plan covers 100 inboxes and 100,000 emails, and its $99 plan covers 500 inboxes and 500,000 emails — so at 100 inboxes you pay $29 instead of $99, and at 300 you get 200 inboxes of headroom for the same money.
Pricing Comparison
Figures as read on 2026-09-16.
| Tier | Dead Simple Email | LobsterMail |
|---|---|---|
| Free | 5 inboxes · 5,000 emails/mo | Unlimited inboxes · 1,000 emails/mo |
| Entry paid | $5/mo — 15 inboxes, 15,000 emails, 1 domain | $9/mo — 10 inboxes, 5,000 emails, 3 domains |
| Mid | $29/mo — 100 inboxes, 100,000 emails, 5 domains | None — next tier is $99 |
| Top published | $99/mo — 500 inboxes, 500,000 emails, 25 domains | $99/mo — 300 inboxes, 100,000 emails, 25 domains |
| Cost per inbox, top tier | $0.20 | $0.33 |
| Cost at 40 inboxes | $29 | $99 |
| Cost at 100 inboxes | $29 | $99 |
The gap between $9 and $99 is where most real agent fleets live. Anything between 11 and 300 inboxes on LobsterMail costs $99/mo; the same range costs $29/mo on Dead Simple Email until you pass 100 inboxes.
Feature Comparison
| Feature | Dead Simple Email | LobsterMail |
|---|---|---|
| Prompt-injection scanning | Yes — scored on every inbound | Yes — six categories, safeBodyForLLM() |
| Agent self-provisioning without an API key | Yes — x402 USDC or a Stripe card, $1.00 per inbox | Yes — no API key required |
| MCP server | Yes — in the official MCP registry | Yes |
| Free-tier emails | 5,000/mo | 1,000/mo |
| IMAP / SMTP | Yes — every inbox | Not advertised |
| SSE / WebSocket streaming | Yes — both | Webhooks or polling |
| Visual dashboard | Yes — all plans | Not advertised |
| SDKs | Python, TypeScript, Go, CLI | JavaScript / TypeScript |
| Dedicated IPs | Enterprise | $99 plan |
| Verification-code / OTP extraction | Yes — dedicated endpoint | Not advertised |
| Bulk inbox create / delete | Yes | Not advertised |
| Agent identity / OIDC sign-in | Yes — Sign in with Dead Simple | No |
| Templates, drafts, contacts, tracking | Yes | Not advertised |
Where LobsterMail Wins
- Unlimited free inboxes. LobsterMail's free plan caps emails, not inboxes, so you can create thousands of addresses on it. If you need many addresses and very little traffic — a test harness, a honeypot fleet — that shape is hard to beat.
- Dedicated IPs at $99. Dead Simple Email keeps dedicated IPs on enterprise plans. If IP isolation matters at 300 inboxes, LobsterMail sells it lower down the ladder.
- A clean TypeScript-first SDK. If your stack is entirely Node and you want one idiomatic client, LobsterMail's is tight and well-shaped.
Who Should Use Dead Simple Email
- Fleets of 11–300 inboxes. The $29 plan against the $99 one, for the same work.
- Python and Go teams. First-party SDKs, not a REST client you write yourself.
- Anyone who needs IMAP. Existing mail tooling, migration paths and human review all run through it.
- Teams that want to see what agents sent without reading logs — the dashboard is on every plan including free.
Frequently Asked Questions
Dead Simple Email. It matches LobsterMail on the two things LobsterMail is best at — prompt-injection scanning on inbound mail and letting an agent provision its own inbox without a human — and fills the pricing gap between LobsterMail's $9 and $99 plans with a $29 tier that covers 100 inboxes and 100,000 emails.
As of September 2026 LobsterMail is free for unlimited inboxes and 1,000 emails/month, $9/mo for 10 inboxes and 5,000 emails, and $99/mo for 300 inboxes and 100,000 emails. Dead Simple Email is free for 5 inboxes and 5,000 emails, $5/mo for 15 inboxes, $29/mo for 100 inboxes and 100,000 emails, and $99/mo for 500 inboxes and 500,000 emails. At 100 inboxes Dead Simple Email costs $29 against LobsterMail's $99.
No. As of September 2026 LobsterMail publishes exactly two paid plans, $9 for up to 10 inboxes and $99 for up to 300. Any fleet larger than 10 inboxes pays $99. Dead Simple Email's $29 Pro plan sits in that gap with 100 inboxes and 100,000 emails.
Yes. Every inbound message is scanned and scored for prompt-injection attempts before your agent reads it, on every plan including free. It is the same defensive idea as LobsterMail's safeBodyForLLM(), and it does not require calling a special accessor to get the safe version.
Yes, in two ways. With an API key it is one POST. Without any credentials, an agent with a wallet can call the same route, receive an HTTP 402 with the price, pay $1.00 inline in USDC over x402 or with a Stripe card over MPP, and retry — the response returns the inbox and, on a wallet's first purchase, an API key.
If you need a very large number of very low-traffic addresses, LobsterMail's free plan caps emails rather than inboxes, which Dead Simple Email's does not. And if you need dedicated sending IPs at around 300 inboxes, LobsterMail includes them on its $99 plan where Dead Simple Email keeps them for enterprise.
All LobsterMail figures on this page were read from its public pricing page on 2026-09-16 and are reproduced for comparison. Vendors change prices; check the source before making a decision, and tell us if anything here is out of date. Full cross-vendor tables: AI agent email API pricing comparison.