I don’t see a logical reason behind it, but WordPress is designed for sending emails from the address [email protected]

Did you spent hours to search where in the settings it’s possible to change this address? Wasted time, there the address is hardcoded, you can’t easily change it!

There are 2 ways to change it:

1. Install a plugin like this: https://wordpress.org/plugins/wp-change-default-email/
2. Write a few lines inside the functions.php in the theme (better if it’s a child theme)

Since I try to avoid to install WordPress plugins, I chose option 2.

In functions.php, add this:

// change the email
function wpb_sender_email( $original_email_address ) {
    return '[email protected]';
}

// change the name
function wpb_sender_name( $original_email_from ) {
    return 'Your Name';
}

// Hook those functions to WP 
add_filter( 'wp_mail_from', 'wpb_sender_email' );
add_filter( 'wp_mail_from_name', 'wpb_sender_name' );