Scam emails

We've received a few e-mails suggesting we have sent an e-mail with an invoice attachment.

We want to confirm this appears to be a scam e-mail, and was never sent by us - it would be impossible since the e-mail address does not exist.  The person mentioned in the e-mail does not work for us.

This has to be a scam, so we can only suggest that you do not open the attachment (it's likely to be a virus) or reply to the message.