About the Return-Path header, as of RFC 5321, Section 4.4. Trace Information, page 58 says, among other things:

A message-originating SMTP system SHOULD NOT send a message that
already contains a Return-path header field.

Effectively, the Return-Path MIME header is added by the Mail Delivery Agent, and not by the Mail Submission Agent. Further information is spread over the whole section 4.4.

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