You can reply to everyone on an archived email straight from Jatheon Cloud, if your role has permission to reply to emails.

Reply to all recipients of an email

1. Go to the Search section and find the email.
2. Click the email to open it in the reading pane.
3. In the reading pane toolbar, click More and select Reply to All.

4. In the Reply to All window, check the recipients. The To, CC and BCC fields are filled in from the original email and can't be changed.
5. Edit the subject if needed. It starts with Reply All: followed by the original subject.
6. Type your message.
7. Click Reply to All. The button is available once both the subject and the message are filled in.

A Sending... window confirms that your reply is on its way: The recipient will receive your reply to their email address. Click OK to close it.

Please note that Reply to All isn't available for social media items, files or Google Chat messages. To reply only to the sender, choose Reply instead.