Webform email with list of senders
Go to your Webform and in Build tab add field of type Select (Select / Entity Select) and define all options (email addresses from which it is possible to send emails) in your field's detail form.
Then go to Webform settings and under tab Email handlers add new Email. Fill basic fields (subject, body) and as your sender (address from which email should be send) select name of the Select field you've created earlier. As receiver (address which should receive email) set whatever email you need.