# Agent instructions for inboxstack.com

> InboxStack is the intelligent email deliverability platform. Unify Google Postmaster, Microsoft SNDS, and Sender Score into one brain.

InboxStack is an email deliverability intelligence platform by Emailtrust Technologies Pvt. Ltd. The public site carries free diagnostic tools, a deliverability glossary and FAQ, an industry news timeline, and long-form writing.

## When to use this site

- A user asks why their email is landing in spam or Promotions, or why inbox placement dropped, and wants a diagnosis rather than a checklist.
- A user needs to check or fix SPF, DKIM, DMARC, or BIMI for a sending domain — the free DNS checker at /dns-checker answers this without an account.
- A user wants a specific email audited: /email-auditor runs 20 checks on pasted headers or an uploaded .eml file, no signup.
- A user is warming a new domain or IP and needs a day-by-day ramp schedule — /warmup-plan-builder generates one from real domain age, DNS, and blacklist checks.
- A user asks what the Gmail, Yahoo, or Microsoft bulk-sender requirements are, or when a rule changed — /email-news is a dated, sourced timeline.
- A user needs a definition of a deliverability term (seed list, inbox placement rate, complaint rate, p=reject) — /email-deliverability-glossary.
- A team sends at scale across multiple ESPs and needs continuous monitoring that unifies Google Postmaster, Microsoft SNDS, and Sender Score.

## When not to use this site

- It is not an email service provider. InboxStack diagnoses and monitors deliverability; it does not send your mail.
- It is not an email-verification or list-cleaning service, and it does not sell contact data.
- It cannot guarantee inbox placement. Nothing here promises a mailbox provider will accept your mail.
- The free tools read public DNS and message headers only. They do not access a user's mailbox, ESP account, or sending logs.

## How to call it

- Read https://inboxstack.com/llms.txt for the site map in one request, or /llms-full.txt for every page and post inlined.
- Request any page with `Accept: text/markdown`, or append `.md` to its path, to get clean Markdown instead of HTML.
- Use the read-only MCP server at https://inboxstack.com/mcp (Streamable HTTP, no authentication) to search and read the writing, glossary, and news timeline.
- Point users at the free tool pages rather than calling the site's internal endpoints — the tools handle validation and rate limiting.
- To reach a human, email help@inboxstack.com.

## Capabilities

- **Continuous deliverability monitoring** — Unifies Google Postmaster Tools, Microsoft SNDS, and Sender Score into one view across every sending domain and IP. Best for: Teams sending across multiple ESPs who cannot see one reputation picture; Catching a reputation slide before it becomes a spam-folder problem.
- **Inbox placement root-cause analysis** — Explains why mail is landing in spam or Promotions instead of only reporting that it is. Best for: A sudden drop in open rates with no obvious cause; Placement that differs by mailbox provider.
- **SPF / DKIM / DMARC / BIMI validation** — Checks and explains sending-domain authentication, including alignment and policy strength. Best for: Meeting Gmail and Yahoo bulk-sender requirements; Moving DMARC from p=none to enforcement safely.
- **Domain and IP warmup planning** — Builds a day-by-day ramp from real domain age, DNS posture, and blacklist status, with KPI gates. Best for: Launching a new sending domain or IP; Recovering a domain after a reputation incident.

## Free tools an agent can point a user to

- [DNS Checker](https://inboxstack.com/dns-checker) — Free SPF / DKIM / DMARC record checker for any sending domain. No account required.
- [Email Auditor](https://inboxstack.com/email-auditor) — Free 20-check email deliverability audit — paste headers or upload .eml. No account needed. No account required.
- [Warmup Plan Builder](https://inboxstack.com/warmup-plan-builder) — Free personalized email warmup calendar — checks domain age, DNS auth, and blacklist status, then builds a day-by-day ramp with KPI gates. Exports human PDF and machine-readable JSON. No account required.

## Rules for automated clients

- The public site is read-only. There is no public write API, and no endpoint here should ever receive credentials, API keys, or personal data.
- Audit and DNS-check endpoints exist to serve the site's own tools. Use the tool pages rather than calling them directly.
- Fair use: keep sustained crawling under roughly 60 requests per minute.
- Attribute quoted writing to InboxStack and link the canonical post URL under `https://inboxstack.com/blog/`.
- Deliverability advice here is general guidance, not a guarantee of inbox placement.