In your profile on GoogSMS, you can enter an alternative email address.
If this is populated, all communication with GoogSMS will be sent to this email. Your email notifications will be sent here and you can reply and send SMS from this address.
I use this on my iPhone to handle all my SMS. I turn on the iPhone push notification so I get push alerts.
This also separates all my SMS from email.
This is also helpful it the email associated with your google voice number isn’t your primary email.
Let me know if you find this useful.