Quote Originally Posted by yaritai View Post
the stock zen_send_mail function in functions_email.php does in fact change the "from" field based on this setting to true or false. In the that function, there is an IF statement that IF the setting is True, then the From field will be the STORE FROM (store email in admin). If it is false, then the function will set the From field to the customer supplied email in the form when submitted.
Yes, it sets the "FROM" field based on that setting, but that's NOT the "ReplyTo" field. The ReplyTo is set to whatever the customer entered.

So, if your email program is ignoring or not respecting the ReplyTo field, then you may want to sort out why it's doing that. I suppose it could be Google Apps that's mangling the ReplyTo, but you'd have to sort that out with them.