What is the issue?
You have received an notification email with the title Action Required: Confirming your additional email addresses in Basware.
It contains the following message:
This means that following security changes, all the email addresses that are contained in the section "I send invoices from" of all the senders that use the service "PDF e-Invoice for Receiving" need to be confirmed.
Email addresses that are not confirmed until January 1st 2019 will not be able to send invoices anymore.