Email Delivery Platform

https://mailchimp.com/developer/transactional/docs/
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A comprehensive documentation set for an email delivery platform, detailing features such as...
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### HTML List Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

An example of an HTML unordered list.

```html
<div>
<ul>
<li>Computer</li>
<li>Monitor</li>
<li>Keyboard</li>
<li>1-Year Insurance</li>
<li>Mouse Pad</li>
<li>Mouse</li>
</ul>
</div>
```

--------------------------------

### Unless Helper Result Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Example HTML output when the 'unless' helper condition is met, displaying a message to the user.

```html
<div class="entry">
  <p>You haven't chosen a username. Please enter a username to register.</p>
</div>
```

--------------------------------

### Split Test Example with Tagged Emails

Source: https://mailchimp.com/developer/transactional/docs/activity-reports

This example illustrates how to set up a split test for emails tagged 'passwordreset'. A portion of these emails will be split into groups to test different templates.

```text
passwordreset
```

--------------------------------

### Each Helper Template Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

An HTML template demonstrating the 'each' helper to iterate over a list of browsers and display them in an unordered list.

```html
<div class="entry">
<ul>
{{#each browsers}}
<li>{{this}}</li>
{{/each}}
</ul>
</div>
```

--------------------------------

### Each Helper Result Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

The resulting HTML after the 'each' helper processes the browser list, rendering each browser as a list item.

```html
<div class="entry">
<ul>
<li>Chrome</li>
<li>Firefox</li>
<li>Explorer</li>
<li>Safari</li>
<li>Opera</li>
</ul>
</div>
```

--------------------------------

### If Helper Merge Data Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Provide merge data for the `{{#if}}` helper to control conditional content rendering.

```json
"global_merge_vars": [
  {
    "name": "user_name",
    "content": "dear_prudence"
  }
]
```

--------------------------------

### Start IP Warm-up via API

Source: https://mailchimp.com/developer/transactional/docs/authentication-delivery

Initiate the warm-up process for a dedicated IP address using the Transactional API. This is useful for gradually increasing an IP's sending reputation.

```HTTP
POST
https://mandrillapp.com/api/1.0/ips/start-warmup.json
Content-Type: application/json

{
    "key": "YOUR_API_KEY",
    "ip": "192.168.1.1"
}
```

--------------------------------

### With Helper Template Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

An HTML template using the 'with' helper to set the context for nested properties like 'updates.body' and 'updates.status'.

```html
<div class="entry">
<h2>{{incident}}</h2>
<p>Impact: {{impact}}</p>
<p>Created At: {{created_at}}</p>
<p>Updates: {{#with updates}} {{body}}: {{status}} {{/with}}</p>
<p>Updated At: {{updated_at}}</p>
</div>
```

--------------------------------

### With Helper Result Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

The final HTML output after applying the 'with' helper, displaying incident details including the nested update information.

```html
<div class="entry">
<h2>Error in connection</h2>
<p>Impact: none</p>
<p>Created At: 2015-02-27T15:27:23+0000</p>
<p>Updates: Testing global variables: update</p>
<p>Updated At: 2015-02-27T16:02:18+0000</p>
</div>
```

--------------------------------

### Comparison Template Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

An HTML template using the 'if' helper with a custom comparison expression (`purchases > 3`) to conditionally render a list of items.

```html
<div>
  {{#if `purchases > 3`}}
    <ul>
      {{#items}}
        <li>{{this}}</li>
      {{/items}}
    </ul>
  {{/if}}
</div>
```

--------------------------------

### Unless Helper Merge Data Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Example JSON structure for 'unless' helper merge variables, specifying a name and content for global merge variables.

```json
"global_merge_vars": [
  {
    "name": "user_name",
    "content": ""
  }
]
```

--------------------------------

### Each Helper Merge Data Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

JSON structure providing the 'browsers' array as content for the 'each' helper in the API request.

```json
"global_merge_vars": [
  {
    "name": "browsers",
    "content": [
      "Chrome",
      "Firefox",
      "Explorer",
      "Safari",
      "Opera"
    ]
  }
]
```

--------------------------------

### With Helper Merge Data Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

JSON data for the 'with' helper, including nested 'updates' object with 'body' and 'status' properties.

```json
"global_merge_vars": [
  {
    "name": "incident",
    "content": "Error in connection"
  },
  {
    "name": "impact",
    "content": "none"
  },
  {
    "name": "updates",
    "content": {
      "id": "9e86a19c-9f9b-447d-b4a8-81f9e71efd85",
      "incident_id": "5a99c8c5-e63f-43f0-b375-df0152211bd8",
      "body": "Testing global variables",
      "status": "update",
      "created_at": "2015-02-27T16:01:55+0000",
      "updated_at": "2015-02-27T16:01:55+0000"
    }
  },
  {
    "name": "created_at",
    "content": "2015-02-27T15:27:23+0000"
  },
  {
    "name": "updated_at",
    "content": "2015-02-27T16:02:18+0000"
  }
]
```

--------------------------------

### Automatic Iteration Over Array Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

An alternative HTML template that achieves the same result as the 'each' helper by automatically iterating over the 'browsers' array.

```html
<div class="entry">
<ul>
{{#browsers}}
<li>{{this}}</li>
{{/browsers}}
</ul>
</div>
```

--------------------------------

### Dot Notation Template Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

An alternative HTML template using dot notation to access nested properties, achieving the same result as the 'with' helper.

```html
<div class="entry">
<h2>{{incident}}</h2>
<p>Impact: {{impact}}</p>
<p>Created At: {{created_at}}</p>
<p>Updates: {{updates.body}}: {{updates.status}}</p>
<p>Updated At: {{updated_at}}</p>
</div>
```

--------------------------------

### Mailchimp Merge Tag Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Example of using Mailchimp merge tags like *|FNAME|*, *|ORDERDATE|*, and *|INVOICEDETAILS|* in a plain text message.

```text
Dear *|FNAME|*,

Thanks for your purchase on *|ORDERDATE|* from ABC Widget Company. We appreciate your business and have included a copy of your invoice below.

*|INVOICEDETAILS|*

-- ABC Widget Co.


```

--------------------------------

### Comparison Merge Data Example

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

JSON data for the comparison expression, including an 'items' array and a 'purchases' variable to be used in the template's conditional logic.

```json
"global_merge_vars": [
  {
    "name": "items",
     "content": [
       "Computer",
       "Monitor",
       "Keyboard",
       "1-Year Insurance",
       "Mouse Pad",
       "Mouse"
     ]
  },
  {
    "purchases": 6
  }
]
```

--------------------------------

### Custom Metadata View Template Example

Source: https://mailchimp.com/developer/transactional/docs/tags-metadata

Use this template to display custom metadata fields like 'user_id' and 'username' in the Outbound Activity, creating a link to a user's profile page.

```html
<a href="http://example.com/user/{{metadata.user_id}}">{{metadata.username}}</a>
```

--------------------------------

### RFC 2047 Subject Encoding Example

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Demonstrates how to encode non-ASCII characters in email subjects according to RFC 2047 for SMTP transport. Ensure your sending tools handle this encoding automatically.

```text
Subject: =?UTF-8?B?TWFuZHJpbGwgbGlrZXMgQVNDSUksIGJ1dCDinaQgVW5pY29kZS4=?=
```

```text
Subject: Mailchimp likes ASCII, but =?UTF-8?Q?=E2=9D=A4?= Unicode.
```

--------------------------------

### Set Up DMARC Record

Source: https://mailchimp.com/developer/transactional/docs/authentication-delivery

Add a TXT record to your domain's DNS settings for DMARC authentication. The minimum value requires `v=DMARC1; p=none`.

```text
Record Name: _dmarc._yourdomain.com
Record Type: TXT
Value: v=DMARC1; p=none
```

--------------------------------

### Enable Open and Click Tracking

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Use the X-MC-Track header to manage open and click tracking settings on a per-message basis. Specify 'opens' for open tracking and 'clicks_all', 'clicks', 'clicks_htmlonly', or 'clicks_textonly' for click tracking.

```smtp
X-MC-Track: opens, clicks_htmlonly
```

--------------------------------

### Tag Messages

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Apply tags to your messages for classification. Tags should be comma-separated strings, with each tag not exceeding 50 characters. Avoid tags starting with an underscore.

```text
X-MC-Tags: password_reset,user_initiated
```

--------------------------------

### Basic IF Condition

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use *|IF:MERGE|* to display content only when a value for MERGE is provided. Use *|IF:MERGE=x|* to display content if the value for MERGE is exactly 'x'.

```text
*|IF:MERGE|*
content to display if a value for MERGE is provided
*|END:IF|*


*|IF:MERGE=x|*
    content to display if the value for MERGE is x
*|END:IF|*
```

--------------------------------

### Search by Clicked URL Patterns

Source: https://mailchimp.com/developer/transactional/docs/activity-reports

Use the 'url' field to find messages where recipients clicked links starting with specific domains. Supports the OR operator for multiple URL patterns.

```lucene
url:twitter.com OR url:facebook.com
```

--------------------------------

### Add a new webhook via API

Source: https://mailchimp.com/developer/transactional/docs/webhooks

Send a POST request to the `_webhooks/add_` endpoint to create a new webhook. The request body should include your API key, the callback URL, an optional description, and a list of events to trigger the webhook.

```APIDOC
## POST /_webhooks/add_

### Description
Adds a new webhook to receive event notifications.

### Method
POST

### Endpoint
`/_webhooks/add_`

### Parameters
#### Request Body
- **key** (string) - Required - Your Mailchimp Transactional API key.
- **url** (string) - Required - The callback URL to receive webhook events.
- **description** (string) - Optional - A description for the webhook.
- **events** (array) - Required - A list of event types to trigger the webhook (e.g., "send", "open", "click", "hard_bounce", "spam").

### Request Example
```json
{
    "key": "YOUR_API_KEY",
    "url": "http://example.com/webhook-url",
    "description": "My Example Webhook",
    "events": [
        "send",
        "open",
        "click",
        "hard_bounce",
        "spam"
    ]
}
```

### Response
#### Success Response (200)
Details of the created webhook (structure not provided in source).

#### Response Example
(No example provided in source)

**Note**: The callback URL must be set up to accept POST requests. A HEAD request will be sent to verify the URL. If it fails, a POST request with an empty `mandrill_events` array will be attempted.
```

--------------------------------

### ELSEIF Condition

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use ELSEIF to display one of several options. Content following the first true condition is displayed, and subsequent conditions are skipped.

```text
*|IF:MERGE=x|*
    <p>content to display if the value for MERGE is x</p>
*|ELSEIF:MERGE=y|*
    <p>content to display if the value for MERGE is not x, but is y</p>
*|ELSEIF:MERGE=z|*
    <p>content to display if the value for MERGE is not x or y, but is z</p>
*|ELSE:|*
    <p>alternate content to display if the value for MERGE is not x, y, or z</p>
*|END:IF|*
```

--------------------------------

### IF and ELSE Conditions

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use IF and ELSE conditions to display content when a condition is true, and alternative content when it evaluates as false.

```text
*|IF:MERGE|*
    content to display
*|ELSE:|*
    alternative content
*|END:IF|*
```

--------------------------------

### Handlebars Block Helper Syntax

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use block helpers with a hash (#) to open and a slash (/) to close. Ensure opening and closing helpers correspond.

```plaintext
{{#helperName arg1 arg2}}
template text
{{else}}
more text
{{/helperName}}

```

--------------------------------

### Enable Inline CSS

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Set this header to `true` to automatically inline CSS for the HTML version of your email. This ensures consistent styling across different email clients.

```text
X-MC-InlineCSS: true
```

--------------------------------

### Verify Domain Ownership with Transactional API

Source: https://mailchimp.com/developer/transactional/docs/authentication-delivery

Use the `/senders/add-domain` endpoint to obtain a `verify_txt_key` for domain verification. This key is appended to `mandrill_verify.` in your domain's TXT records.

```json
{
  "domain": "example.com",
  "verify_txt_key": "mandrill_verify.Yfe0JuqvZBiYIUXmTwQNiA"
}
```

--------------------------------

### X-MC-InlineCSS

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Automatically inline CSS for the HTML version of an email. Set to `true` to enable this feature.

```APIDOC
## X-MC-InlineCSS

### Description
Manage the inlining of CSS for the HTML version of an email. When set to `true`, Mailchimp will automatically inline your CSS styles.

### Format
`true` or `false`

### Example
```
X-MC-InlineCSS: true
```
```

--------------------------------

### Verify Domain Ownership via Email Link

Source: https://mailchimp.com/developer/transactional/docs/authentication-delivery

A verification link is sent to a specified email address. Clicking this link completes the domain verification process.

```html
http://mandrillapp.com/settings/verify-domain?domain=example.com&key=VERIFICATION_KEY
```

--------------------------------

### Conditional Display with Unless Helper

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use the `{{#unless}}` helper to display content when an expression evaluates to false. This is equivalent to 'if not'.

```html
<div class="entry">
  {{#unless user_name}}
    <p>You haven't chosen a username. Please enter a username to register.</p>
  {{/unless}}
</div>
```

--------------------------------

### Add a New Webhook via API

Source: https://mailchimp.com/developer/transactional/docs/webhooks

Use this JSON payload to configure a new webhook by sending a POST request to the `_webhooks/add_` endpoint. Ensure you replace 'YOUR_API_KEY' with your actual API key and specify the desired events and callback URL.

```json
{
    "key": "YOUR_API_KEY",
    "url": "http://example.com/webhook-url",
    "description": "My Example Webhook",
    "events": [
        "send",
        "open",
        "click",
        "hard_bounce",
        "spam"
    ]
}
```

--------------------------------

### Unsubscribe Link Merge Data Configuration

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Define the redirect URL for the `unsub` helper using global merge variables in JSON format.

```json
"global_merge_vars": [
	{
		"name": "redirect_merge_var",
		"content": "http://example.com/unsub"
	}
]
```

--------------------------------

### Add Reverse DNS Entry via API

Source: https://mailchimp.com/developer/transactional/docs/authentication-delivery

Configure reverse DNS settings for a dedicated IP address using the Transactional API. This maps a custom domain to your IP for improved deliverability.

```HTTP
POST
https://mandrillapp.com/api/1.0/ips/add-reverse-dns.json
Content-Type: application/json

{
    "key": "YOUR_API_KEY",
    "ip": "192.168.1.1",
    "domain": "mail.example.com"
}
```

--------------------------------

### Conditional Display with If Helper

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use the `{{#if}}` helper to conditionally render content. Content is displayed if the expression is not false, undefined, null, empty string, 0, or an empty array.

```html
<div class="entry">
  {{#if user_name}}
    <p>Thanks for registering! Your username is {{user_name}}.</p>
  {{/if}}
</div>
```

--------------------------------

### Verify Domain Ownership via API

Source: https://mailchimp.com/developer/transactional/docs/authentication-delivery

This endpoint allows you to verify domain ownership programmatically. You will receive a `verify_txt_key` which should be appended to `mandrill_verify.` in your domain's TXT records.

```APIDOC
## POST /senders/verify-domain

### Description
Verifies domain ownership using the Transactional API. This is an alternative to manual verification through DNS TXT records or email links.

### Method
POST

### Endpoint
/senders/verify-domain

### Parameters
#### Request Body
- **domain** (string) - Required - The domain name to verify.
- **email** (string) - Required - A valid email address within the domain to send a verification link to.

### Request Example
{
  "example": "{\"domain\": \"example.com\", \"email\": \"sender@example.com\"}"
}

### Response
#### Success Response (200)
- **domain** (string) - The verified domain name.
- **email** (string) - The email address used for verification.
- **status** (string) - The verification status (e.g., "pending", "verified").
- **verify_txt_key** (string) - A unique key to be added to your domain's TXT records for verification.

#### Response Example
{
  "example": "{\"domain\": \"example.com\", \"email\": \"sender@example.com\", \"status\": \"pending\", \"verify_txt_key\": \"mandrill_verify.Yfe0JuqvZBiYIUXmTwQNiA\"}"
}
```

--------------------------------

### X-MC-Important

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Prioritize sending for a message. Set to `true` to give important messages priority over other messages currently being sent.

```APIDOC
## X-MC-Important

### Description
Flag important messages to give them priority over other messages you’re currently sending. This ensures critical emails are processed faster.

### Format
`true` or `false` (defaults to `false`)

### Example
```
X-MC-Important: true
```
```

--------------------------------

### Generate HTML from Plain Text

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Employ the X-MC-AutoHtml header to automatically generate an HTML version of your plain-text emails. Set the value to 'true', 'on', 'yes', or 'y' to enable it.

```smtp
X-MC-AutoHtml: false
```

--------------------------------

### Test SMTP Server Reachability with Ping

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Ping Mailchimp's SMTP servers to check basic network reachability and latency.

```bash
ping smtp.mandrillapp.com
```

--------------------------------

### URL Encode Text with Handlebars Helper

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use the `url` inline helper to URL-encode provided text.

```handlebars
{{url "http://example.com"}}
```

--------------------------------

### Prioritize Important Messages

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Flag important messages by setting this header to `true`. This gives them priority over other messages currently being sent.

```text
X-MC-Important: true
```

--------------------------------

### Provide Merge Data via API

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use global_merge_vars for default values and merge_vars for recipient-specific values when sending via the API. These are provided as JSON objects.

```json
    "message": {
            "global_merge_vars": [
                {
                    "name": "var1",
                    "content": "Global Value 1"
                }
            ],
            "merge_vars": [
                {
                    "rcpt": "jsmith@example.com",
                    "vars": [
                        {
                            "name": "fname",
                            "content": "John"
                        },
                        {
                            "name": "lname",
                            "content": "Smith"
                        }
                    ]
                }
            ],
    ...
```

--------------------------------

### Use Stored Templates

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Specify an HTML template stored in your Mailchimp Transactional account using the X-MC-Template header. Format is 'template_name|block_name', where block_name is optional.

```smtp
X-MC-Template: my_template
```

--------------------------------

### Add Unsubscribe Link with Handlebars Helper

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use the `unsub` helper to automatically generate an unsubscribe link. The URL provided will add the recipient to the Rejection Denylist and mark them as unsubscribed.

```handlebars
<a href='{{unsub "http://example.com/unsub"}}'>Unsubscribe</a>
```

--------------------------------

### Numerical Comparisons in Mailchimp Transactional

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Employ numerical operators like >=, <=, >, <, and == for conditional content display based on numeric values. Use ELSEIF for multiple tiers of conditions.

```Mailchimp Transactional Templating
*|IF:AGE >= 18|* 
Don't forget to vote this Tuesday! 
*|END:IF|*
*|IF:PURCHASES >= 20|* 
Enjoy this 40% off coupon! *|COUPON20|* 
*|ELSEIF:PURCHASES >= 10|* 
Enjoy this 20% off coupon! *|COUPON10|* 
*|ELSE:|* 
Enjoy this 10% off coupon! *|COUPON|* 
*|END:IF|*
```

--------------------------------

### X-MC-Metadata Header for SMTP

Source: https://mailchimp.com/developer/transactional/docs/tags-metadata

Use the X-MC-Metadata header with a JSON-encoded set of key-value pairs when sending via SMTP.

```json
X-MC-Metadata: { "user_id": "45828", "location_id": "111" }
```

--------------------------------

### Provide Dynamic Content for mc:edit Regions via API

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Inject dynamic content into `mc:edit` regions using the `template_content` parameter in the Transactional API's `_messages/send_` endpoint. This allows for targeted content updates.

```json
"template_content": [
        {
            "name": "header",
            "content": "<h2>Your Order is Complete</h2>"
        },
        {
            "name": "main",
            "content": "We appreciate your business. Your order information is below."
        }
    ]
```

--------------------------------

### Search by Time Range, Subject Phrase, and Open Events

Source: https://mailchimp.com/developer/transactional/docs/activity-reports

Construct a complex query using time ranges for sending and opening, and a specific subject phrase. Supports 'ts' for timestamps and quoted phrases for exact matches.

```lucene
ts:[1609459200 TO 1609462800] AND subject:"Order Receipt" AND opens.ts:[1609459200 TO 1609466400]
```

--------------------------------

### X-MC-Subaccount

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Specify a subaccount for sending mail. The subaccount must exist for the mail to be sent successfully.

```APIDOC
## X-MC-Subaccount

### Description
Select a subaccount for sending mail. The provided subaccount ID must correspond to an existing subaccount in your Mailchimp account.

### Format
The unique ID of the subaccount for the message.

### Example
```
X-MC-Subaccount: my_subaccount
```
```

--------------------------------

### X-MC-Tags

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Tag your messages for classification. This header accepts a comma-separated list of strings, where each string is a tag to apply to the message.

```APIDOC
## X-MC-Tags

### Description
Use tags to classify certain types or groups of emails you send. Tags help in organizing and filtering your email campaigns.

### Format
Comma-separated list of strings. Each string is a tag. Tags have a maximum length of 50 characters. Tags starting with an underscore are reserved for internal use.

### Example
```
X-MC-Tags: password_reset,user_initiated
```
```

--------------------------------

### Embed Image with Static URL

Source: https://mailchimp.com/developer/transactional/docs/outbound-email

Use a standard `img` tag to embed an image hosted at a static URL directly in your HTML content.

```html
<img src="http://example.com/image.jpg" alt="My image" />
```

--------------------------------

### Embed Image with Merge Tag

Source: https://mailchimp.com/developer/transactional/docs/outbound-email

Dynamically insert image file names into your HTML content using merge tags. Ensure the image is accessible via the specified URL.

```html
<img src="http://example.com/*|IMAGENAME|*" alt="My image" />
```

--------------------------------

### Title Case Text with Handlebars Helper

Source: https://mailchimp.com/developer/transactional/docs/templates-dynamic-content

Use the `title` inline helper to convert provided text to title case.

```handlebars
{{title "your text is neat"}}
```

--------------------------------

### Customize Tracking Domain

Source: https://mailchimp.com/developer/transactional/docs/smtp-integration

Set a custom tracking domain for your emails using the X-MC-TrackingDomain header, overriding the default 'mandrillapp.com'.

```smtp
X-MC-TrackingDomain: example.com
```
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