While I'm still not certain of the prompt you refer to, here are some hints at where to look.
CWIS > Properties > Services > Email > Setup > From Field > Edit
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CWIS > Properties > Services > Email > Setup > General > Auto Add Me
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And if you have Authentication enabled, it could be tied to the personalization option ala CWIS > Properties > Login / Permissions / Accounting > Personalized Touch UI
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Clik here to view.
