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Spoofing SMTP (mail) source address?

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The Question is:

 
Hello Mr. Wizard,
 
	We are running an UCX on OpenVMS with the following versions :
 
Digital TCP/IP Services for OpenVMS VAX Version V4.2 - ECO 2 on a VAX
7000-620 running OpenVMS V6.2.
 
	I need to be able to send mail from the VAX to the internet and be
able to specify the "from" address (as in the sendmail "-f" parameter. Is
this possible ? We can change the domain but this is not workable as other
users need to keep the appropriate add
ress.
 
Thanks In Advance ........  David

The Answer is :

 
  The substitute domain is the general approach, via the UCX or TCPIP
  utility:
 
    SET CONFIG SMTP /SUBSTITUTE_DOMAIN=(HIDDEN,foobar.com)
 
  The Callable MAIL API allows an appropriately-privileged user to replace
  the username portion of the source address as part of the send operation,
  though the standard MAIL command interface does not permit direct access
  to this capability.
 
  Alternatively, a sufficiently-privileged application could connect to
  port 25.
 

  
     
     answer written or last revised on ( 1-JUL-1999 )
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