Currently the forgot password feature used the email address specified in the MailMe_FromAddress appconfig parameter. To change this, you would need to open up the signin.aspx.cs page and change the line in the btnRequestNewPassword_Click method
Code:
String FromEMail = AppLogic.AppConfig("MailMe_FromAddress");
You could go as far as creating a new appconfig (in this example let's call it MailMe_ForgotPasswordFromAddress), then you could specify your customerservice@domain.com email address there and change the line in signin.aspx.cs to read
Code:
String FromEMail = AppLogic.AppConfig("MailMe_ForgotPasswordFromAddress");
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