Sortd is an all-in-one Sales, Service and Task tracking app for Gmail Teams. It allows you to effortlessly manage your emails, customers, tasks and workflows, without ever leaving your Inbox.

BTW, Sort(e)d according to the Urban Dictionary means “When a task or idea is completed” and the Oxford Dictionary ”organized, arranged, or dealt with satisfactorily.”  Of course the fact that you can Sort your email into lists also helps!