For Google Classroom integration, these hosts are needed:
Chat-based support is provided to teachers and requires these hosts:
How do I ensure that THiNKtech emails are delivered?
All messages are delivered from email@example.com and delivered from the hosts: *authsmtp. You can whitelist this from address and sending server.
How do I ensure microphone access?
For Speak iT, your browser will prompt you to allow access to your microphone. Go into your browser settings and allow access to your microphone for gothinktech.com.