you need to set your app name aka sitename in config\app.php
Code:
/*
|--------------------------------------------------------------------------
| Application Name
|--------------------------------------------------------------------------
|
| This value is the name of your application. This value is used when the
| framework needs to place the application's name in a notification or
| any other location as required by the application or its packages.
*/
'name' => 'UNIT3D',
as for email theme can make it whatever you want here
Code:
resources/views/vendor/mail/html/themes/unit3d.css
as for email templates there here
Code:
resources/views/emails