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View all email headers in Mail on iCloud.com

By default, each email you receive displays the email’s sender, recipients, and date. If you want to see more details about an email—such as an email’s return and delivery paths, “Reply-to” field, and content type—you can display all headers.

Go to icloud.com/mail, then sign in to your Apple Account (if necessary).
Select an email.
Tap , then tap Show All Headers.
To stop showing all headers, tap , then tap Show Default Headers.

Note: If a checkmark is shown in the header area, that means an email is digitally signed and its authenticity has been verified. See What is a digitally signed and encrypted email?

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iCloud.com User Guide for iPhone

View all email headers in Mail on iCloud.com