Reply all typically means responding to an email by sending your reply to all recipients of the original email, which may include everyone in the email thread. It does not necessarily mean everyone in your address book.
If the person sending the email to you also sent the same email to 10 other people then using the reply to all would send a reply to the person that sent you the email and the other 10 people.
Can you define what you mean by UNIT as we can try and base a reply on this
When you 'reply', the reply is only sent to the person who wrote the mail. When you 'reply to all' the reply is sent to the person who wrote the mail + everyone who received the mail.
Clicking this will reply to all messages with whatever you typed.
Please reply to our invitation by September, 1, 2012. He raised his hand to reply to the teacher's question.
Yes, it does.
No Reply at All was created on 1981-09-09.
respond
Reply to email function will send email to all the address in the "cc" of the original email, so if you want to only send email to one person you must only use "reply" not "reply to all"
You can reply to a post on Tumblr using the small speech bubble at the bottom of the post. Not all posts allow you to reply.
Wow, too many unknowns. First, what do you mean by a reply? If you mean a reply from an intelligent creature, that has evolved to the point they could receive the message and then send a reply -- we don't know there are any such creatures. If you mean a reply from a transponder in a near Earth satellite the answer is less then a second.