About: http://webisa.webdatacommons.org/273321762

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	They cover platforms such as Sendmail, Postfix, qmail, Microsoft Exchange, and Notes/Domino, so somewhere in that list you should find your mail system.
http://www.w3.org/ns/prov#wasQuotedFrom	amazon.ca