# Plunk

> Plunk is an open-source, all-in-one email platform for developers. It unifies marketing, transactional, and broadcast email behind a single API — built to handle millions of contacts with workflows, segments, templates, and deliverability tooling out of the box.

Plunk can be used as a hosted service at useplunk.com or self-hosted via Docker. Source code lives at https://github.com/useplunk/plunk.

Pages listed below with a `.md` suffix serve a Markdown version (also available by requesting the same URL with `Accept: text/markdown`). Other pages are HTML only.

For full product documentation, see the docs site: https://docs.useplunk.com/llms.txt

## Product

- [Plunk home](https://www.useplunk.com/index.md): Product overview, features, and positioning
- [Pricing](https://www.useplunk.com/pricing.md): Plans, included volume, and overage pricing
- [Made by humans](https://www.useplunk.com/made-by-humans): The team and story behind Plunk

## Features

- [Email editor](https://www.useplunk.com/features/email-editor.md): Drag-and-drop and code-based template editor
- [Workflows](https://www.useplunk.com/features/workflows.md): Event- and segment-triggered automation flows
- [Segments](https://www.useplunk.com/features/segments.md): Dynamic and static contact segments
- [SMTP](https://www.useplunk.com/features/smtp.md): Send through Plunk over standard SMTP
- [Inbound email](https://www.useplunk.com/features/inbound-email.md): Receive email at your verified domain and turn it into events

## Comparisons

- [Plunk vs Resend](https://www.useplunk.com/vs/resend)
- [Plunk vs SendGrid](https://www.useplunk.com/vs/sendgrid)
- [Plunk vs Mailchimp](https://www.useplunk.com/vs/mailchimp)
- [Plunk vs Mailgun](https://www.useplunk.com/vs/mailgun)
- [Plunk vs Postmark](https://www.useplunk.com/vs/postmark)
- [Plunk vs Customer.io](https://www.useplunk.com/vs/customerio)
- [Plunk vs Loops](https://www.useplunk.com/vs/loops)
- [Plunk vs Brevo](https://www.useplunk.com/vs/brevo)
- [Plunk vs ActiveCampaign](https://www.useplunk.com/vs/activecampaign)
- [Plunk vs Klaviyo](https://www.useplunk.com/vs/klaviyo)
- [Plunk vs ConvertKit](https://www.useplunk.com/vs/convertkit)
- [Plunk vs Bento](https://www.useplunk.com/vs/bento)
- [Plunk vs MailerLite](https://www.useplunk.com/vs/mailerlite)
- [Plunk vs Amazon SES](https://www.useplunk.com/vs/amazon-ses)
- [Plunk vs Mailjet](https://www.useplunk.com/vs/mailjet)
- [Plunk vs Buttondown](https://www.useplunk.com/vs/buttondown)
- [All comparisons](https://www.useplunk.com/vs)

## Guides

- [Email API guide](https://www.useplunk.com/guides/email-api-guide): Choosing and integrating with an email API
- [Email deliverability](https://www.useplunk.com/guides/email-deliverability): Reaching the inbox reliably
- [Email bounce rate](https://www.useplunk.com/guides/email-bounce-rate): What it is and how to reduce it
- [Email open rate](https://www.useplunk.com/guides/email-open-rate): Benchmarks and improvement tactics
- [Email click-through rate](https://www.useplunk.com/guides/email-click-through-rate): Measuring and improving CTR
- [Email sender reputation](https://www.useplunk.com/guides/email-sender-reputation): Protecting your sending reputation
- [Email marketing best practices](https://www.useplunk.com/guides/email-marketing-best-practices)
- [Transactional vs marketing email](https://www.useplunk.com/guides/transactional-vs-marketing-email)
- [What is SPF](https://www.useplunk.com/guides/what-is-spf)
- [What is DKIM](https://www.useplunk.com/guides/what-is-dkim)
- [What is DMARC](https://www.useplunk.com/guides/what-is-dmarc)
- [All guides](https://www.useplunk.com/guides)

## Tools

- [Verify email](https://www.useplunk.com/tools/verify-email): Check a single email address for validity
- [Spam checker](https://www.useplunk.com/tools/spam-checker): Score an email for spam triggers
- [Markdown to email](https://www.useplunk.com/tools/markdown-to-email): Convert Markdown into HTML email
- [SPF checker](https://www.useplunk.com/tools/spf-checker)
- [DKIM checker](https://www.useplunk.com/tools/dkim-checker)
- [DMARC checker](https://www.useplunk.com/tools/dmarc-checker)
- [MX checker](https://www.useplunk.com/tools/mx-checker)
- [Email headers analyzer](https://www.useplunk.com/tools/email-headers)
- [All tools](https://www.useplunk.com/tools)

## Optional

- [Documentation](https://docs.useplunk.com): Product, API, and self-hosting docs
- [Discord community](https://www.useplunk.com/discord)
- [Privacy policy](https://www.useplunk.com/privacy)
- [Terms of service](https://www.useplunk.com/terms)
- [Data processing agreement](https://www.useplunk.com/dpa)