How to send letters from one domain in order to receive a response to another domain - email?

Question

Email

Using the mailgun service, I set up sending letters from my service.
Task: you need to send emails to subscribers' emails from the address [email protected], which is verified in mailgun.
There are many users in the service, each has its own email address and can be anything (ya.ru, mail.ru, gmail.com, etc.).
How to configure sending from [email protected] so that the return address contains the user's address in a non-moydomain.ru domain so that letters do not fall into spam ?
From [email protected]
Reply-to [email protected]