Useful quick tip for those occasions when someone sends a message to you and a number of other addressees. You start drafting the reply before you remember that you should have hit the ‘Reply All’ button instead. WIthout the keyboard shortcut described below you either needed to start again or copy and paste the other email addresses.
So if you receive a message where you are just one of many addressees.
You then hit the Reply button and draft your reply. Then realise you needed to add the other addressees. You can using the keyboard shortcut ⌘⇧R. A simple solution that is much easier than copy and pasting the missing email addresses.