# Email tools

- Human page: https://happytails.ai/en/email-tools/
- Markdown: https://happytails.ai/en/email-tools.md
- Structured JSON: https://happytails.ai/agents/en/email-tools/index.json
- Visibility: public

## Page guide

Find the tool you need, then open it to get started.

## All email tools

- [DKIM checker](https://happytails.ai/en/email-tools/dkim-checker/): Domain plus selector lookup. ([Markdown](https://happytails.ai/en/email-tools/dkim-checker.md))

- [DMARC checker](https://happytails.ai/en/email-tools/dmarc-checker/): Parse policy, reporting addresses and inheritance. ([Markdown](https://happytails.ai/en/email-tools/dmarc-checker.md))

- [Email header analyzer](https://happytails.ai/en/email-tools/email-header-analyzer/): Local parsing of hops and authentication results. ([Markdown](https://happytails.ai/en/email-tools/email-header-analyzer.md))

- [Email signature generator](https://happytails.ai/en/email-tools/email-signature-generator/): Create a simple HTML email signature with your contact details. ([Markdown](https://happytails.ai/en/email-tools/email-signature-generator.md))

- [Eml to PDF](https://happytails.ai/en/email-tools/eml-to-pdf/): Render headers/body and attachment manifest. ([Markdown](https://happytails.ai/en/email-tools/eml-to-pdf.md))

- [Eml viewer](https://happytails.ai/en/email-tools/eml-viewer/): Local MIME parsing with disabled remote assets and attachment listing. ([Markdown](https://happytails.ai/en/email-tools/eml-viewer.md))

- [SPF checker](https://happytails.ai/en/email-tools/spf-checker/): DNS lookups, include-chain limits and findings. ([Markdown](https://happytails.ai/en/email-tools/spf-checker.md))

## Separate message formatting from delivery diagnostics

Email tools can inspect addresses, message headers, templates and domain configuration. These tasks answer different questions: a syntactically valid address is not the same as a mailbox that exists, and a configured domain is not a guarantee of inbox placement.

## How to choose your next step

Use complete headers or the exact domain needed for the task. Avoid treating one message or one lookup as proof of a general delivery pattern.

## Common questions about email tools

### Does address validation prove a mailbox exists?

Syntax checks can catch formatting mistakes but cannot prove that a person receives mail at an address. Server-side checks can also be inconclusive.

### Do authentication records guarantee inbox delivery?

No. Authentication is one signal among several. Sending behavior, recipient engagement and filtering rules also affect what happens to a message.