Gmail campaign sender Bulk-send emails and follow up automatically if no reply

# Try me out
1. Clone [this Google worksheet](https://docs.google.com/spreadsheets/d/12dsbRpvtVFDdPmyZ7-39vuHuFpM1eMyfOqGGGdsnrtc/edit#gid=0) and update the 'Settings' node with its URL (plus change any other settings there you need to)
2. Adjust the sequence of emails you want to send in the 'Email Sequence' node

Make sure you set how many days after the previous email to wait before sending, and note that the emails are in HTML format.