gistfile1.txt

Hi Bob,

Just wanted to inform you that we have not yet received payment of 
invoice ####-##.

I'm sure you must have mistakenly overlooked this. I've included 
a copy of the invoice for your convenience.

If payment has already been sent, please disregard this email. Do 
not hesitate to contact me if you have any questions.

Kind regards,
Thijs van der Vossen