Rated 4 out of 5 stars

I have just installed the add-on hoping it will meet all my needs. I already have a Thunderbird address book and a Google contacts account. I have created groups in both so I can send emails to multiple recipients from either Thunderbird or an email app on my phone.

One task I often do is to forward incoming emails to a group in my Thunderbird address book, or a Google Contacts group on my phone. It there a way to do this using Cardbook?

This review is for a previous version of the add-on (61.1). 

Hi
yes this is possible, just start typing the name of the group and the email autocompletion should propose it (or type F9 and use the contact sidebar)