Dear :

We would like to inform you that bill of exchange No. for $ was returned to us from our bank marked "Refer to Drawer." The bill was due on [date] and appeared to have been dishonored.

We will allow you a further days before presenting the bill to the bank again, in which time we hope that the draft will have been met. If the account is still not settled, we will have to make a formal protest, which we hope will not be necessary.

Sincerely yours,

[name]

[title]