About: http://webisa.webdatacommons.org/18069873

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	For this you would need the help of the people managing the receiving mail servers and they will ask you some questions such as the exact time you sent your email (without that they need to go through a lot of logs.
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com