The emails are a scam and should be deleted and then ignored.
Please see https://myonlinesecurity.co.uk/a-new-blackmail-scam-attantion-wannacry-team/ for more information.
We have identified that there is an external internet routing issue which was affecting access to our hosted services. We have taken action to mitigate this and restore service to our datacentres. Users should now be able to connect normally.