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User Email getting appended to display name while sending email through Apex/S-Control

I'm trying to send an email using apex (and S-control).
Everything is working fine except the context user's (user who is executing it) email Id is getting appended to the display name.
We dont want any details of the user to be seen by the customer even his email Id.
How to avoid this?
Any pointers will be of great help.
Need it urgent. Please help!!!!!
Thanks in Advance,