Sometimes in Outlook I want to be able to see the last few emails I received or sent to a client.

As there can be several individual email addresses per client, the only way to reliably identify emails as belonging to a client is to look at the domain part of the email address, eg the `company` in `person@company.com`

How can I add this as a sortable column in the main views (`Inbox`, `Sent Items`, etc)?