Best way to manage a group email?

What would be the best way for 3 seperate people to access a single cpanel email account using gmail? I guess we could all simply sign into the same Cpanel email account in Gmail, but then we dont all have access to the individual 'sent' emails... A scenario would be that we receive an email and one of the team replies to it, but the other two team members dont realise that the email has been replied to. Any help would be most appreciated. Thanks