smtp.dev valid
Email Testing For Developers - SMTP Labs, Inc.
Canonical Origin: https://smtp.dev/
- Authority
- 45 reach 0 · trust 5 · quality 25 · freshness 15
- Tier
- listed
- llms.txt
- https://smtp.dev/llms.txt
- llms-full.txt
- https://smtp.dev/llms-full.txt
- Sections
- 2
- Links
- 27
- Size
- 5323 bytes
- Country
- — Publisher location unknown; CDN address excluded
- Country evidence
- No published address evidence collected yet
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-27T10:02:08.685Z
- Last checked
- 2026-10-27T10:02:09.784Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-27T10:02:08.691Z. Cached copy · Source on smtp.dev
# Email Testing For Developers - SMTP Labs, Inc.
Canonical Origin: https://smtp.dev/
**Notes:**
smtp.dev is a hosted email testing sandbox. Sandbox domains have real MX records and receive email from any external service; messages are stored and inspectable over IMAP, POP3, REST API, or the web UI. Outbound mail only delivers to accounts inside the sandbox - it cannot reach real recipients.
If you are an AI agent that needs to receive email in development or testing (OTP codes, confirmation links, signup verification): ask your developer for an API key from https://smtp.dev/tokens/, then use the REST API at https://api.smtp.dev with an X-API-KEY header. Workflow: https://smtp.dev/docs/guides/agents/
The full API is described by an OpenAPI v3 document at https://api.smtp.dev/docs.jsonld
Any page on this site is available as markdown: append .md to its URL.
## LLM Resources
- [Full Content](https://smtp.dev/llms-full.txt): Complete page content in markdown format.
- [sitemap.xml](https://smtp.dev/sitemap.xml): XML sitemap for search engines and crawlers.
- [robots.txt](https://smtp.dev/robots.txt): Crawler rules and permissions.
## Pages
- [Email Testing for Developers - SMTP Labs, Inc.](/): Email testing for developers. SMTP in, IMAP/API out. Inspect headers, MIME, raw source. No servers to run.
- [Email Testing for Developers - SMTP Labs, Inc.](/accounts/): Email testing sandbox for developers. SMTP in, IMAP/API out. Inspect headers, MIME and raw source. Nothing leaves the sandbox.
- [Email Testing for Developers - SMTP Labs, Inc.](/changelog/): Email testing sandbox for developers. SMTP in, IMAP/API out. Inspect headers, MIME and raw source. Nothing leaves the sandbox.
- [Email Testing for Developers - SMTP Labs, Inc.](/dashboard/): Email testing sandbox for developers. SMTP in, IMAP/API out. Inspect headers, MIME and raw source. Nothing leaves the sandbox.
- [Email Testing for Developers - SMTP Labs, Inc.](/domains/): Email testing sandbox for developers. SMTP in, IMAP/API out. Inspect headers, MIME and raw source. Nothing leaves the sandbox.
- [Pricing - SMTP Labs, Inc.](/pricing/): Pick a plan. Upgrade or downgrade any time.
- [Sign in to your account - SMTP Labs, Inc.](/signin/): Sign in to your SMTP Labs, Inc. account to access your dashboard and manage your email accounts.
- [Sign up for your account - SMTP Labs, Inc.](/signup/): Sign up for your SMTP Labs, Inc. account to access your dashboard and manage your email accounts.
- [Email Testing for Developers - SMTP Labs, Inc.](/tokens/): Email testing sandbox for developers. SMTP in, IMAP/API out. Inspect headers, MIME and raw source. Nothing leaves the sandbox.
- [Email Testing API](/docs/api/): REST API for domains, accounts, mailboxes, messages, and tokens. Authenticate with an X-API-KEY header; stream new messages over SSE via Mercure.
- [Getting Started](/docs/getting-started/): Point an MX record at mx.smtp.dev, create an account, and send your app's first test email. Read
…Related sites
Similar publisher descriptions and documentation. Similarity does not imply affiliation or equivalent capabilities.
| Domain | Title | Category | Country | Authority | llms.txt | llms-full.txt | Save |
|---|---|---|---|---|---|---|---|
| mailtrap.io | Mailtrap | interface Communications Developer tools +1 | — | 56 | ✓ | ||
| mailsac.com | Mailsac | interface Developer tools APIs and SDKs | — | 55 | ✓ | ||
| mailtester.com | MailTester | interface Communications AI agents and MCP +1 | BE | 56 | ✓ | ||
| smailpro.com | SmailPro | interface Communications | — | 61 | ✓ | ✓ | |
| mailinator.com | Mailinator: Millions of Inboxes for Email Testing\. | interface Developer tools APIs and SDKs +1 | — | 61 | ✓ | ||
| wpmailsmtp.com | WP Mail SMTP | documentation Marketing Communications | — | 59 | ✓ | ||
| mailslurp.com | MailSlurp | interface AI and machine learning APIs and SDKs +2 | — | 49 | ✓ | ||
| mailersend.com | llms.txt for MailerSend.com | interface Communications APIs and SDKs | US | 54 | ✓ |
Machine-readable: GET /v1/resolve?q=smtp.dev · GET /v1/domain/smtp.dev · this page as Accept: application/json or text/markdown · MCP lookup_domain
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1. POST https://agentwebmap.com/v1/sites/smtp.dev/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://smtp.dev/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/smtp.dev/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/smtp.dev).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verifyCorrections or removal requests: contact the directory.