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https://github.com/KamilLelonek/ex_postmark

Postmark adapter for sending template emails in Elixir
https://github.com/KamilLelonek/ex_postmark

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Postmark adapter for sending template emails in Elixir

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# ex_postmark

[![Build Status](https://travis-ci.org/KamilLelonek/ex_postmark.svg?branch=master)](https://travis-ci.org/KamilLelonek/ex_postmark)

This is a library inspired by [`swoosh`](https://github.com/swoosh/swoosh) for [Postmark](https://postmarkapp.com/) service to send [template emails](http://developer.postmarkapp.com/developer-api-templates.html#email-with-template).

## Installation

If [available in Hex](https://hex.pm/docs/publish), the package can be installed as:

1. Add `ex_postmark` to your list of dependencies in `mix.exs`:

```elixir
def deps do
[{:ex_postmark, "~> 1.x.x"}]
end
```

2. Ensure `ex_postmark` is started before your application:

```elixir
def application do
[applications: [:ex_postmark]]
end
```

## Usage

You will need to prepare a couple of files to make `ex_postmark` working.

### Config

Here is the way how to prepare specific config files:

**Development**

```elixir
# config/dev.ex

config :your_application, YourApplication.Mailer,
adapter: ExPostmark.Adapters.Local
```

You can access all sent emails using [convenient `ExPostmark.Adapters.Local.Storage` functions](https://hexdocs.pm/ex_postmark/ExPostmark.Adapters.Local.Storage.html#functions).

**Tests**

```elixir
# config/test.ex

config :your_application, YourApplication.Mailer,
adapter: ExPostmark.Adapters.Test
```

You can access the recent sent email as:

```elixir
assert_received {:email, email}
```

**Production**

```elixir
# config/prod.ex

config :your_application, YourApplication.Mailer,
adapter: ExPostmark.Adapters.Postmark,
server_api_key: System.get_env("POSTMARK_SERVER_API_KEY")
```

Emails are being sent using regular Postmark platform.

### Mailer

Next, you have to prepare a corresponding mailer:

```elixir
# your_application/mailer.ex

defmodule YourApplication.Mailer do
use ExPostmark.Mailer, otp_app: :your_application
end
```

Note that `otp_app` represents the configured name.

### Creating an email

Firstly, you have to prepare an email. You can do that in two ways:

**1. Using `new/1` constructor**

```elixir
Email.new(
from: {"From", "[email protected]"},
to: "[email protected]",
cc: ["[email protected]", {"CC2", "[email protected]"}],
bcc: "[email protected]",
reply_to: "[email protected]",
headers: %{"X-Accept-Language" => "pl"},
template_id: 1,
template_model: %{name: "name", team: "team"}
)
```

**2. Using builder functions**

```elixir
email = Email.new()
|> Email.to("[email protected]")
|> Email.cc("[email protected]")
|> Email.bcc("[email protected]")
|> Email.template_id(123)
|> Email.put_template_model(:name, "Name")
|> Email.put_template_model(:team, "Team")
```

All functions are available in [docs](https://hexdocs.pm/ex_postmark/ExPostmark.Email.html#functions).

### Sending an email

Once you have an `Email` prepared, you can use your predefined `Mailer` to send it:

```elixir
YourApplication.Mailer.deliver(emai)
```

And that's it, your email should be sent.

**A note about subjects:**

There is a way to set a subject for your email using a template, but it's not done out of the box. You need to make sure to add an additional variable `subject` for your template model and then put it in a place of a `Subject line`.

Here is the final configuration:

![Postmark subject](https://monosnap.com/file/MUem7zVYzB75Oh64FgOUkxGQG98tRZ.png)

Later on, you can use subject in a convenient method like:

```elixir
email = Email.new()
|> Email.subject("[email protected]")
# ...
```

but don't be confused, as it's not a regular way to put a custom subject.

## Tests

To run all tests, execute:

mix test

Keep in mind that the default command will skip integration tests. To include them, run:

mix test --include integration

For integration test make sure you have the following vairables exported in your environment:

- `POSTMARK_SERVER_API_KEY ` - Server API token required for authentication from Postmark server credentials
- `POSTMARK_EMAIL_FROM ` - your verified sender signature in Postmark
- `POSTMARK_EMAIL_TO ` - any existing recipient email
- `POSTMARK_TEMPLATE_ID ` - an ID of configured template in Postmark

## Contributing

1. [Fork the repository](https://github.com/KamilLelonek/ex_postmark) and then clone it locally:

```bash
git clone https://github.com/KamilLelonek/ex_postmark
```

2. Create a topic branch for your changes:

```bash
git checkout -b fix-mailchimp-pricing-bug
```

3. Commit a failing test for the bug:

```bash
git commit -am "Adds a failing test that demonstrates the bug"
```

4. Commit a fix that makes the test pass:

```bash
git commit -am "Adds a fix for the bug"
```

5. Run the tests:

```bash
mix test
```

6. If everything looks good, push to your fork:

```bash
git push origin fix-mailchimp-pricing-bug
```

7. [Submit a pull request.](https://help.github.com/articles/creating-a-pull-request)

## Documentation

Documentation is written into the library, you will find it in the source code, accessible from `iex` and of course, it all gets published to [hexdocs](https://hexdocs.pm/ex_postmark).