Good suggestions both of youse.
I was thinking about sending a copy via mail with the "duplicate" stamped on it to be sure.
I was just talking to that particular customer again who told me she hasn't received any invoices by email, only regualr email so I faxed it.
This really focks up my cash flow as there are about 20 customers that have experienced this.
I'll try the fax thingy too! Triple redundancy......now that's redundant.
