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name : README.md
<h1 align="center">
  Mailpit - email testing for developers
</h1>

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<br>
<p align="center">
  <a href="https://mailpit.axllent.org">Website</a>  •
  <a href="https://mailpit.axllent.org/docs/">Documentation</a>  •
  <a href="https://mailpit.axllent.org/docs/api-v1/">API</a>
</p>

<hr>

**Mailpit** is a small, fast, low memory, zero-dependency, multi-platform email testing tool & API for developers.

It acts as an SMTP server, provides a modern web interface to view & test captured emails, and includes an API for automated integration testing.

Mailpit was originally **inspired** by MailHog which is [no longer maintained](https://github.com/mailhog/MailHog/issues/442#issuecomment-1493415258) and hasn't seen active development or security updates for a few years now.

![Mailpit](https://raw.githubusercontent.com/axllent/mailpit/develop/server/ui-src/screenshot.png)


## Features

- Runs entirely from a single [static binary](https://mailpit.axllent.org/docs/install/) or multi-architecture [Docker images](https://mailpit.axllent.org/docs/install/docker/)
- Modern web UI with advanced [mail search](https://mailpit.axllent.org/docs/usage/search-filters/) to view emails (formatted HTML, highlighted HTML source, text, headers, raw source, and MIME attachments
including image thumbnails), including optional [HTTPS](https://mailpit.axllent.org/docs/configuration/http/) & [authentication](https://mailpit.axllent.org/docs/configuration/http/)
- [SMTP server](https://mailpit.axllent.org/docs/configuration/smtp/) with optional STARTTLS or SSL/TLS, authentication (including an "accept any" mode)
- A [REST API](https://mailpit.axllent.org/docs/api-v1/) for integration testing
- Real-time web UI updates using web sockets for new mail & optional [browser notifications](https://mailpit.axllent.org/docs/usage/notifications/) when new mail is received
- Optional [POP3 server](https://mailpit.axllent.org/docs/configuration/pop3/) to download captured message directly into your email client
- [HTML check](https://mailpit.axllent.org/docs/usage/html-check/) to test & score mail client compatibility with HTML emails
- [Link check](https://mailpit.axllent.org/docs/usage/link-check/) to test message links (HTML & text) & linked images
- [Spam check](https://mailpit.axllent.org/docs/usage/spamassassin/) to test message "spamminess" using a running SpamAssassin server
- [Create screenshots](https://mailpit.axllent.org/docs/usage/html-screenshots/) of HTML messages via web UI
- Mobile and tablet HTML preview toggle in desktop mode
- [Message tagging](https://mailpit.axllent.org/docs/usage/tagging/) including manual tagging or automated tagging using filtering and "plus addressing"
- [SMTP relaying](https://mailpit.axllent.org/docs/configuration/smtp-relay/) (message release) - relay messages via a different SMTP server including an optional allowlist of accepted recipients
- [SMTP forwarding](https://mailpit.axllent.org/docs/configuration/smtp-forward/) - automatically forward messages via a different SMTP server to predefined email addresses
- Fast message [storing & processing](https://mailpit.axllent.org/docs/configuration/email-storage/) - ingesting 100-200 emails per second over SMTP depending on CPU, network speed & email size,
easily handling tens of thousands of emails, with automatic email pruning (by default keeping the most recent 500 emails)
- [Chaos](https://mailpit.axllent.org/docs/integration/chaos/) feature to enable configurable SMTP errors to test application resilience
- `List-Unsubscribe` syntax validation
- Optional [webhook](https://mailpit.axllent.org/docs/integration/webhook/) for received messages


## Installation

The Mailpit web UI listens by default on `http://0.0.0.0:8025` and the SMTP port on `0.0.0.0:1025`.

Mailpit runs as a single binary and can be installed in different ways:


### Install via package managers

- **Mac**: `brew install mailpit` (to run automatically in the background: `brew services start mailpit`)
- **Arch Linux**: available in the AUR as `mailpit`
- **FreeBSD**: `pkg install mailpit`


### Install via bash script (Linux & Mac)

Linux & Mac users can install it directly to `/usr/local/bin/mailpit` with:

```bash
sudo bash < <(curl -sL https://raw.githubusercontent.com/axllent/mailpit/develop/install.sh)
```


### Download static binary (Windows, Linux and Mac)

Static binaries can always be found on the [releases](https://github.com/axllent/mailpit/releases/latest). The `mailpit` binary can be extracted and copied to your `$PATH`, or simply run as `./mailpit`.


### Docker

See [Docker instructions](https://mailpit.axllent.org/docs/install/docker/) for 386, amd64 & arm64 images.


### Compile from source

To build Mailpit from source, see [Building from source](https://mailpit.axllent.org/docs/install/source/).


## Usage

Run `mailpit -h` to see options. More information can be seen in [the docs](https://mailpit.axllent.org/docs/configuration/runtime-options/).

If installed using homebrew, you may run `brew services start mailpit` to always run mailpit automatically.


### Testing Mailpit

Please refer to [the documentation](https://mailpit.axllent.org/docs/install/testing/) on how to easily test email delivery to Mailpit.


### Configuring sendmail

Mailpit's SMTP server (default on port 1025), so you will likely need to configure your sending application to deliver mail via that port. 
A common MTA (Mail Transfer Agent) that delivers system emails to an SMTP server is `sendmail`, used by many applications, including PHP. 
Mailpit can also act as substitute for sendmail. For instructions on how to set this up, please refer to the [sendmail documentation](https://mailpit.axllent.org/docs/install/sendmail/).

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