Name the alma mater of the scientist famous for Email filtering ?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/knownFor> <http://dbpedia.org/resource/Email_filtering> . ?x <http://dbpedia.org/property/almaMater> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Scientist>}
Email_filtering