http://www.rfc-editor.org/rfc/rfc4496.txt
RFC 4496: Open Pluggable Edge Services (OPES) SMTP Use Cases, M. Stecher, A. Barbir2006-05-01T23:00:00-00:00The Open Pluggable Edge Services (OPES) framework is application agnostic. Application-specific adaptations extend that framework. This document describes OPES SMTP use cases and deployment scenarios in preparation for SMTP adaptation with OPES. This memo provides information for the Internet community.