is this an email attack attempt?

I got a mail by wordpress@then my website
with this content:
A new member has registered on your site ecovillage education:

Username: ronny

E-mail: dondy228@hotmail.com

but I do not have a member registration on that website.
What exactly does this mean? Do I have to inform anybody about it?
What exactly is the attempt behind it. Do I have to take preventive action?
thanks for any suggestions
michel