What is Inbox Preview?

Inbox preview is a paid feature in partnership with Litmus, the leading email and spam testing tool.

It is critical for successful e-mail marketers to know the way their content is displayed in order to score higher rates of engagement. The challenge today is that an email to 20 individuals could be displayed in 20 different formats! VBOUT’s Inbox Preview allows you to preview the email across multiple systems in seconds.

With Inbox Preview, you are able to test how your email templates will look like before you send them out to your subscribers. Here is a list of the email clients available for testing:

Web-Based Microsoft Window Cell phones and other mobile devices Mac OS X
  • Gmail (Chrome)
  • Gmail (Firefox)
  • Office 365 (Chrome)
  • Office 365 (Firefox)
  • Outlook.com (Chrome)
  • Outlook.com (Firefox)
  • Yahoo! Mail (Chrome)
  • Yahoo! Mail (Firefox)
  • Outlook 2013
  • Outlook 2016
  • Outlook 2019
  • Outlook office 365
  • Android 6.0
  • Gmail App (Android)
  • iPad (Retina)
  • iPad Mini
  • iPhone 8
  • iPhone 8 Plus
  • iPhone SE (Gen 2)
  • iPhone 11
  • iPhone 12
  • iPhone 12 mini
  • iPhone 12 Pro Max
  • Apple Mail 13
  • Apple Mail 14
  • Outlook 2016

How can I run my tests?

We conveniently placed the option to run your tests in the following 3 sections:

  1. Directly from the “Campaigns” page, “Edit” drop down. Below is an example with A/B testing activated and you can test both versions of the campaign.A/B testing
  2. From the “Preview” eye icon, select “Inbox Preview”:Inbox preview
  3. You can access it directly from under the “Edit Template” area:


Once you click on the Inbox Preview, you will be prompted with the popup below to choose which email client to test:

Inbox preview different devices

After choosing from the options available, the engine will generate the previews in a popup window and provide the following controls:

  1. Ability to re-test your chosen email clients.
  2. Create a new test and add new email clients.
  3. You can preview the history of your tests in case you made edits to your content and ran multiple tests.
  4. Number of available credits.

Email Inbox preview

How can you get access to this powerful add-on?

Inbox Preview is based on Credit Usage. Each email client you choose will use one credit and each time you RE-TEST, you will use an additional credit. Your credit allowance will reset at the end of each billing cycle no matter how many credits have been used.

If you are doing A/B testing, you will have the option to choose the test for each version of your campaign:

Selecting devices and email clients with inbox preview

Here is a quick example: if you chose Android 6, iPhone 8 and Gmail (Chrome) you will use 3 credits. If you make edits and run the test again on the same email clients, 3 additional credits will be used.

You can easily purchase an add-on from our add-on center.

Inbox Preview Add-on

For any information regarding VBOUT’s pricing structure, check our pricing page.