Allow plus addressing (subaddressing) recipients with the sandbox domain
I kindly request that you consider implementing support for parameterized email addresses within the Mailgun sandbox. This enhancement would greatly improve the testing experience and allow for more comprehensive email testing scenarios.

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kcaldwell commented
I hope this message finds you well. I am writing to request a new feature for the Mailgun service, specifically regarding the usage of parameterized email addresses within the Mailgun sandbox.
Currently, while testing the Mailgun sandbox, I have encountered a limitation that prevents me from sending test emails with parameters in the recipient address. For example, I am able to whitelist the email address "dev@domain.com" successfully, but I am unable to test parameterized addresses such as "dev+test@domain.com."
Parameterized email addresses are commonly used in testing environments and provide valuable flexibility for organizing and categorizing incoming test emails. By allowing parameterized addresses in the Mailgun sandbox, developers like myself would be able to more effectively test and debug email-related functionalities, ensuring a smoother integration with the Mailgun service.