The add_header method in the email.mime.multipart.MIMEMultipart class is used to add a header field to the multipart message. Within an email, headers provide additional information about the message, such as the sender, recipient, subject, or date. This method allows you to append a new header field to the existing headers of the multipart message, ensuring that the message is properly formatted according to the MIME (Multipurpose Internet Mail Extensions) specification.
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