In your admin
look at the bottom left and select a page
then on the right select edit
then on the 3rd tab select publish so that page will be seen in the folder you installed to.
On the Etomite there are doc files that will help.
I get that all the time.
Its part of having a domain.
I reduced a lot of this type of spam by turning off the catchall feature
set the default address to :fail:
That way only email to a valid address will get through.