You can't use email-to-sms to forward gmail emails as an SMS because the emails are sent from 'email@example.com' which is a generic email address used for all Gmail accounts. Since we use the from address as authentication we won't know how to differentiate different clients.
We do have a few solutions though:
Zapier is a great way to link multiple services together. Depending on your usage you can sign up for a free or paid account.
Instructions: Use Zapier to link Gmail and ClickSend
We can setup an email address which will accept forwarded email from any address. There is a monthly fee of $19 USD for this service (converted to your currency).
We can develop a custom solution for you to forward your Gmail emails to a SMS. Get in touch with our support team to find out how.
Our award-winning customer care team is here for you.Contact Support