Will I need to verify my email in order to activate my email service?
I can't imagine that Gmail would allow an external domain to collect emails without permission…Yet salesforce hasn't sent me any type of forwarding verification request…
Furthermore, how can I monitor that my service is working?
Add a system.debug in your apex class for the subject and search for the text receiving mail from gmail in your debug log:
Here is a sample code below how I got the confirmation code
Enable the bounce back option to your mail so that you can track it easily.
220084905- Confirmation code