Sending, receiving, and organizing email in Outlook.com
Hello,
This usually happens if a rule accidentally got set up or a mobile swipe action is acting up. Since the menus are completely different depending on what you use I want to make sure I give you the right steps to check this.
Are you checking your emails through the outlook website on a browser, your phone's mail app, or the actual outlook program installed on a Windows computer?
Also let me know if this is happening to every single email you receive or just messages from specific senders so we can figure out exactly what is doing it.