You can add a custom prefix to your mabl mailbox email addresses. While mabl supports creating multiple distinct email addresses in a single test, tagging them with a custom prefix can help you easily mark and differentiate them. (e.g. querying for results containing the chosen string in your own databases).

Here are the steps to follow:

1. Create a variable - choose mabl mailbox address

2. Create another variable - choose string template of the form prefix+{{@email_address}}. You can use the following separators after your prefix:

• - dash
• _ underscore
• + plus sign

3. Use your new variable as you would normally for a mabl mailbox address, and have your Application Under Test send email to that address.

4. The email will be available in the Mail section of the trainer, click the "Insert Step" plus button in the toolbar at the bottom of the screen and search for the Mailbox step type.