Locate the invoices and check their status in Basware Portal. If the invoices are listed in Basware Portal, the receiver should be able to see them, too.
If you cannot find the invoices in Basware Portal:
Check outbox of your email client and make sure that the invoices have been sent.
Make sure that you have sent the invoices to the correct email address.
Make sure that you have sent the invoices from an email address that you have confirmed. You can check email addresses in the Basware Portal.