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The Errors-To header is specifically designed to indicate where mailer-generated errors should be sent. When an email cannot be delivered for any reason, the mail server uses the address specified in the Errors-To header to send notifications regarding these delivery issues. This is particularly useful for managing undeliverable messages and ensuring that the sending party is aware of any problems with their emails.

In contrast, the other headers mentioned serve different purposes. The Content-Transfer-Encoding header is used to specify the encoding method applied to the email message bodies, such as whether the content is encoded in base64 or quoted-printable formats. The Mime-Version header denotes the version of the MIME protocol being employed, which helps in correctly interpreting the email's structure and content types. Lastly, the Content-Type header is crucial for indicating the nature of the content in the email, such as whether it is plain text, HTML, or another format, but it does not indicate where to send errors related to the email delivery. Thus, the Errors-To header is indeed the correct choice, as it directly addresses error handling for email communications.