With Kutools for Outlook’s Sender utility, you can quickly search all emails from selected email's sender in Outlook as follows:

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1. Please select an email in your Outlook which you want to search all emails from its sender, and then apply this utility by clicking Kutools > Search >  By Sender > Emails contains the sender. See screenshot:

2. After clicking Sender, the email sender’s address will be automatically added to the Search field for searching all emails.

Notes: Besides, you can apply this utility by right-clicking on the email, and then select Find Related (Kutools) > By Sender > Emails contains the sender from the context menu. See screenshot:

Tip: In this Video, Kutools tab is added by Kutools for Outlook. If you need it, please click here to have a 60-day free trial without limitation!