As in the case of loshon hora, the prohibition of rechilus involves meaningless or destructive gossip only. Reporting to a person concerning what someone else said or did against him l’toeles, for a constructive purpose, is not considered speaking rechilus and may, in fact, be considered a mitzvah.
However, a clear understanding of the conditions which make such reporting permissible, complemented by a generous dose of objectivity, are absolute prerequisites for conveying such information.