Spam Sent From WebMail

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Hi,
Lately we've noticed an alarming trend of spam being sent out from our
webmail server.    It seems the new viruses will actually connect to
the webmail server and log in as the user (saved username/password in
internet explorer).   It then sends e-mail from the user's webmail
account, but it doesn't send it as the user, instead it somehow
manages to forge the FROM address.

Does anyone have any ideas how this is happening (forging of the
address) and has anyone else managed to figure out a way (short of a
captcha) to stop this?

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