Reply to all cc'ed - Mail OSX When I receive an email which has been cc'ed to a few people, is there a way where  I can set the default reply mode to "reply to all", rather than "reply to just the sender"?
I guess you are using the Mail application by Apple.
In this case, you just need to press the "double arrow" button, rather than the "single arrow", to reply to all the senders, as you can see here:



Otherwise, you can use the shortcut Shift+Cmd+R to perform the same "reply to all" operation.