About: http://webisa.webdatacommons.org/194402057

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	Your question is a bit confusing, as you refer to a text-based mail client and a PHP application and then specify that the application (i.e. your PHP application) to store email (or data extracted from that) in a database.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com