Over time an email account may accumulate aliases which all flow into a single inbox in Outlook. This article explains how to identify the recipient a sender has used when sending the email.

Check this article on managing these emails using rules: https://collset.happyfox.com/kb/article/53-how-to-identify-an-email-sent-to-an-alias-using-rules/

1. In the Outlook app, fully open the email by double clicking it:

2. Go to File > Properties to show the header:

3. Click on the contents of the header and Select all (right-click > Select All or Ctrl + a): 

4. Copy the header contents and past into a text editor like notepad (Word works as well) and search for "To:" to show the alias.

In this example, I sent an email to [email protected], an alias of [email protected]: