I’m sure most of us try to keep our Inbox and Sent Items tidy. It’s possible to set up rules to move emails around, but it’s not always clear cut what the best way to do it is. My preferred method is to every now and again do a search that grabs everything from a customer’s domain that is in the Inbox and in the Sent Items in one go and then drag that into their folder. It’s quick and neat. In the Outlook search bar (Press Ctrl-E if you like keyboard shortcuts) type the following to search for anything sent to, or received from, example.com:
(to:example.com OR from:example.com) AND (folder:Inbox OR folder:"Sent Items")
Check over the results and then drag them all into a folder.