Hi {!First Name},
I hope this note finds you well. I want to follow up on an invoice I emailed on {!Date}. I haven’t received the payment yet, so I wanted to ensure the email isn’t lost somewhere in depths of cyberspace. Would you please check to see if the accounts payable department has received it? I’ll be happy to resend if necessary. Otherwise, I look forward to receiving payment within a week.
I really appreciate your help! Thanks!