Mailer question

[Donnie Love]

I've got an Altos 3068 Unix System V machine running Scope 
Microgateway DDN software.  I've been testing the SMTP 
implementation and have a small problem.  Whenever I receive 
mail from an originator on the DDN,  the first line of the 
mail indicates that the mail is from "root" on the local system.  
This causes "root" to be displayed whenever I print the mail 
header summary.  Also,  when I reply the note goes back to 
"root".  The first line of the mail message is not in RFC-822 
format,  but seems to be a local Unix header line.

My question is,  which piece of software is building this first 
line of header?  Is it the SMTP server (doubtful),  or the local 
mailer (more probable)?  I don't have access to the SMTP server 
or Altos local mailer source code,  so I can't point the finger 
in any direction.  If anyone knows the answer,  I would greatly 
appreciate some information.

Donnie R. Love
Open Systems Group
Fairfax,  Va.