Editing ISO Development Environment (section)

=== PP ===
ISODE formed the basis an implementation for the [[X.400]] email protocol, called PP.<ref>{{cite journal|title=The PP Manual| journal=University College and X-Tel Services LTD., London | date=1991 |url=https://scholar.google.co.uk/citations?view_op=view_citation&hl=en&user=apGmpycAAAAJ&citation_for_view=apGmpycAAAAJ:LkGwnXOMwfcC | last1=Kille | first1=Steve | last2=Onions | first2=Julian }}</ref><ref group=Footnote>PP does not stand for anything.  It was a project joke that it did not stand for "[[Postman Pat]]", while "Postman Pat" is a good description of the software, it would have created copyright issues to have used this name.</ref>   PP included a fully operational [[SMTP]]/[[MIME]] email server and an X.400/SMTP Mixer<ref>{{cite web|title=RFC 2156|date=January 1998 |url=http://datatracker.ietf.org/doc/rfc2156/|publisher=IETF|access-date=22 December 2012 |last1=Kille |first1=Steve }}</ref> gateway.
PP also implemented a P7 Messagestore (PPMS).

PP was designed by [[Steve Kille]] and the lead engineer was Julian Onions.