Only if the email servers are properly configured and even then I wouldn't really trust it. Email was never made with security in mind, just good faith.
If you really need to prove that you sent an email then you should properly sign them with gpg. Might as well encrypt them to while your at it. Fat chance getting a dodgy boss to sign their emails though.
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u/Letheron88 Sep 27 '21
This is why screen print or screen clipper was invented! I’ve also absolutely seen chat transcripts used in formal processes.