How can I obtain "Internet headers" (FULL HEADERS) of an email?

Full Mail Headers is the complete set of Email headers added by the sender's email software and related Email Servers during the email delivery process. It contains helpful information on the email message delivery and routing, including IP addresses involved, time sent, and email sources.

A) Using Microsoft Outlook for Windows
B) Using Microsoft 365 Outlook Web App (OWA / Webmail)
C) Using Microsoft Outlook for Mac


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