Select whether to allow the user to change sender E-mail address ("From" address). The default is [Allow] (without user authentication) or [Login User Address] (with user authentication enabled).
Allow the user to change the "From" address.
[Administrator E-Mail Address]
Prohibit changing of the "From" address and use the administrator's E-mail address.
[Login User Address]
Prohibit changing of the "From" address and use the user's E-mail address. Administrator's E-mail address is used if user's E-mail address has not been registered.