Your response affects others.
Use “reply all” if your response may affect other people. For example, if your company is hosting a team exercise next Saturday in Palm Springs, California, and you are interested in this, you can use “reply all” to share it.
Your question is important for everyone:
If you have a question that would be relevant afghanistan whatsapp phone number data to most people in the email chain, such as requesting clarification about the exact day of the event, then “reply all” is the best option.
You have been asked to use “reply all.”
If the person who sent the original email asks you to use “reply all,” then that is what you should do. They may feel that your input can be helpful to everyone involved.
Want to close the conversation:
Using “reply all” can be a good way to close an email chain.
When not to use it?
There are times when using “reply all” is not the best option. Here are some examples:
Irrelevant information
If you have information to share that is only relevant to the original sender or a few people in the thread, there is no need to send the reply to everyone. As a general rule, if the reply is irrelevant to most recipients, don't use the "reply all" feature.

Correct errors
Pointing out someone's mistake by using a "reply all" can create a toxic atmosphere and is considered unprofessional. If you need to talk to someone about a mistake, do so using the "reply" button, or better yet, face to face.
Complaints
Avoid involving everyone in one thread when expressing discontent. Communicate directly with the person you disagree with.
Personal Questions
If you have a question for the sender that is only relevant to you and no one else in that thread, use "reply" instead of "reply all."