Refus de proposition commerciale

Dear [Mr or Mrs or Sirs], We acknowledge receipt of your letter of [date] and thank you for your proposal concerning [...]. This [service] seems to be very useful and efficient, but we unfortunately do not trade with foreign customers and do not require [service]. However, we suggest that you be in contact with [nom] of [société], who may be interested by such a service. [Société] deals with [domaine] and certainly needs [service]. Thank you for contacting us. Yours sincerely [votre nom] [votre fonction]