Wondering what your customers see when they get an email from Billy?
Invoice emails are sent from a firstname.lastname@example.org email address. This is because of the way transactional emails and our SMTP server is set up.
However, customer will see your business name in the from field and when they reply, their emails will go to your email address.
So make sure you account name is set up the way you want your customers to see it and that the email address in your user account is one you can check.