set_content_type(m, user_content_type, class_default) private

Used by #mail to set the content type of the message.

It will use the given user_content_type, or multipart if the mail message has any attachments. If the attachments are inline, the content type will be “multipart/related”, otherwise “multipart/mixed”.

If there is no content type passed in via headers, and there are no attachments, or the message is multipart, then the default content type is used.

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