POP3 client using another user's IMS SMTP address

[McCrary Earl Contr 411 FLTS/TSF]

How can I prevent a POP3 email client from using another user's SMTP address
in the From: field of an email message?

Here's the situation:   When configuring a POP3 email client on a networked
connected workstation using a valid network user account;  I can configure
the POP3 client to use any users' Exchange container name as the username
(blank password) and once configured, send an email to the Exchange Server
IMS connector for delivery via SMTP.  The email arrives at the destination
with the "forged" user's address in the FROM field.

Is there some setting on the IMS connector to prevent this?  

Earl McCrary,  MCSE, CCNA
F-22 Combined Test Force
CSC, Federal Sector - Defense Group
661.277.7993


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