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Using Mustache Syntax to Customize Mailchimp Templates

Using Mustache Syntax to Customize Mailchimp Templates

RebelMouse has many ways that we can help to simplify your newsletter campaign workflow. Our integration with Mailchimp allows you to automate your daily or weekly newsletter (using an algorithm to select the top-performing posts of either period) or to use our Entry Editor to create a post, which can then be sent to Mailchimp and distributed to your appropriate lists. You are also able to simply select the correct template for any post you send as a newsletter (or your automated newsletters).

Here we will describe how to use the Mustache template syntax with data to render posts in your newsletters. This is a method that we created to make it easy to augment your newsletters by using Mustache templates. You can learn more about the Mustache template here:

To tell an HTML block to render as a Mustache template, we need to create an HTML tag with the "mc:edit" attribute, and have it contain the value "_mustache" as a postfix. For example:

<div mc:edit="posts_list_mustache"></div>

Then, during rendering of the newsletter, the Mustache syntax will be replaced with variables from our posts.

The minimal code needed would be, for example, this code snippet:

<div mc:edit="posts_list_mustache">
  <a href="{{ post_url }}"><img src="{{image600x}}"></a>
   <a href="{{ post_url }}" target="_blank">{{ header }}</a>

List of Variables

For the "posts_list" List:




Header/Headline of a post


Subheader/Subheadline of a post


Post URL


Lead image 600x


Lead image 300x


Lead image 980x


Image (this displays an image and works in Gmail correctly)


Body text before listicle/particle


Body text after listicle/particle


Author names list

author_name0, author_name1, author_name2, author_name{}

Author names


Author avatars list

author_avatar0, author_avatar1, author_avatar2, author_avatar{}

Author avatars


Created date


Is keep reading enabled for the post


Tags list


A list of listicles/particles


A list of related posts

For the "listicle_items_list" List:




Check if the image is set for a given listicle/particle


Listicle/Particle 600x px image


image (this displays an image and works in Gmail correctly)


Sometimes instead of the lead image, media HTML might be defined


Listicle/Particle headline


Listicle/Particle body


Particle URL


True if the post has brief parameter filled (used to determine Keep Reading)


Brief parameter (used to show the first part of Keep Reading)

For the "listicle_items_by_groups" List:

(In case you are dealing with multicolumn listicles.)




Marks if a given particle is multicolumn


Is this a two-column layout


Is this a three-column layout


Is this a parallax layout


Is this an e-commerce layout


First item of a particle


Second item of a particle


Where {} is a number, it will render information about a given item. So in case we are dealing with a three-column layout, we will have item0, item1 and item2. For a two-layout column, it's item0 and item1. And for single-column layout, only item0 will be available.


A Boolean that determines if slug of particle is starting with sponsored content or a sponsored response. Used to determine if the post is sponsored.


True if the post has a brief parameter filled (used to determine Keep Reading)


Brief parameter (used to show the first part of Keep Reading)

For the Item object for the "listicle_items_by_groups" List:




Item base name


Please refer to the "image choices" section


Is it the first particle


Is it the last particle


Does the particle contain an image


Particle headline


Sometimes instead of the lead image, media HTML might be defined


A URL to a given particle


ID of a particle


Index of a particle


Link to a given particle


Particle body (not parsed)


Particle description (parsed)

Image Choices:




Checks if an image is set for a given listicle/particle


Listicle/Particle 600x px image


Image (this displays an image and works in Gmail correctly)


Same as image


Image 210x


Image 300x


Image 600x


Image 980x


Image 35x35


Image 300x300


Image 600x200


Image 600x300


Image 600x400


Image 600x600


Image 750x1000


Image 700x1245


Image 1000x750


Image 1200x400


Image 1200x600


Image 1200x800


Image 1245x700


Image 1500x2000


Image 2000x1500

Here is an example of a simple HTML template with Mustache syntax used:

Creating a Template in Mailchimp

To create a template in Mailchimp, we need to log in to the Mailchimp dashboard, then go to the Templates view and create a new template:

Then select the "Paste in code" option in the next step:

Now you can copy-paste the sample template from the GitHub link above.

Once that's been entered, you simply click Save and Exit in the bottom-left corner of the screen. Then you'll be prompted for a name for the template. Enter a familiar name for your template that helps keep you organized and you're through this part! You can continue to edit the template to make it fully your own, too.

Testing the Template

To test your template, the easiest way would be to create a new "Audience" or "List" in your Mailchimp dashboard, and then add test emails to your newly created audience.

From our Entry Editor, go to the Send a Newsletter tab and select your newly created audience and test template:

After publishing a post, you should receive a test email that uses the test template. Note that if you have any errors in the code in the template, Mailchimp may not receive the newsletter. If you notice that the draft isn't appearing in your Campaigns tab in Mailchimp when you send to Mailchimp, you'll want to check your code to be sure that there are no errors.

You can repeat this flow by changing something in your template, saving it, and then editing this post in Entry Editor and checking the changes in the emails you will receive.

If you have any questions, please contact your account manager or

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