In non-SMTP systems that use RFC-822, it depends on where that system states the envelope return path is stored. If there is no out-of-band place to store the envelope return path, the system should most appropriately use the Return-Path: header. -- _.John G. Myers Internet: jgm+@CMU.EDU LoseNet: ...!seismo!ihnp4!wiscvm.wisc.edu!give!up