In face-to-face communications, there are three ways to complete the communication circle:

1. Inquiry: You ask a question.
2. Responding with an answer.
3. Acknowledgement by saying 'thank you' or by nodding your head.

We do something similar...

There is no need to keep an email thread going on and on. It's about completing the communication circle.

• When someone answers your question, you can respond by thanking them. But nothing further is required.
• You can stop responding if the person doesn'...

The need for further responses depends on the situation and your audience.

• When someone emails about moving the time of a meeting, they need confirmation that you received and read the email. 
• Cultural differences might inform when you stop res...

If you're included in an email thread with many other recipients, you don't need to reply to everyone. You can only respond to the sender unless the group needs to know your response. It is reasonable to have a sidebar conversation with only those who need to be included.