About: http://webisa.webdatacommons.org/173071240

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	...that will take a given email address and test whether is is a working address.
http://www.w3.org/ns/prov#wasQuotedFrom	freelancer.com