(from stored messages in .msg files into packets), the origin net/node within
the  *packed message* header would be set to the local system's address
net/node (for the destination zone), always. This is the appropriate action
when packing EchoMail, but not for NetMail.

Now, there are lot of other header fields in the packed message that contain
the source/origin address (e.g. @FMPT, @INTL kludges) and those would reflect
the original origin address still. And these fields take precedence over the
orign net/node fields of the packed message header. So I'm not sure this bug
would actually cause any problems anywhere, but it was a bug all the same.