Populate 'To' recipient on custom mail form

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Nov 10, 2015
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Can anyone offer an example of code to populate the 'To' recipient on a custom mail form using a concatenated string formed by values entered into three custom fields? The form would be opened by the user so they can populate the three fields.
[Fax Number]
[To Company]
[Cover Sheet] (List of Values)

I want to populate the 'To' recipient field when a button is clicked. The string would be
"FAX=[Fax Number]/[To Company]/[Cover Sheet]

Thanks in advance for advice or code examples.
 
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