Hello Doreen,

Thanks for reaching out. I don't know anything about the application that your clients are using, but typically how you'd do this is to set the "Reply-To" header within the email content. That way, when the user responds to the email, they will be replying to a specific email address.

Here is an example of how the EML might look with a custom "Reply-To" header:

From: alert@companyxyz.com
To: customer@example.com
Subject: Quote for Your Order
Reply-To: Amy@companyxyz.com
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"

Here is the quote you requested...

In this example, the email is sent from alert@companyxyz.com, but the "Reply-To" header is set to Amy@companyxyz.com. When the recipient replies to this email, the response will be directed to Amy's email address.

Please let me know if you have any other questions or need further assistance.

Thanks,