I am using Windows 10 Enterprise Version 1709 Build 16299.309 and was configurating the Mail App for the first time. I use the App in German.
When starting the App, a screen appears for setting up the first mail account. I can choose between different providers. Some choices lead to a separate dialog appears for entering my data. For example, if I select the option for another account, there is a text field for entering the name I want to use for sending e-mails. This text field also appears when selecting iCloud or from the extended setup the option Internet e-mail. The following screenshot refers to the extended setup.
Currently the translation to German is Ihre Nachrichten mit diesem Namen senden. I would use Ihre Nachrichten unter diesem Namen senden.