app/views/user_mailer/_invoice_ready_message.html.haml
%p= "Hello #{invoice.account.user.name} <#{invoice.account.user.email}>,"
%p
#{invoice.company.owner.name} has invited you to #{link_to 'EasyKeep', root_url}, to view an invoice created for you.
You can view this invoice through the link below.
%p= link_to 'Your Invoice', invoice_url(invoice)