Administrative letter by which the Commission informs a complainant of its intention to reject the complaint. This letter defines the Commission’s preliminary position regarding a complaint and gives the complainant an opportunity to make further observations and comments within a specified time limit. Because of its nature as a preparatory and preliminary document, an Article 6 letter cannot be challenged in Court as a separately reviewable act. However the complainant may insist that a final decision rejecting his complaint be taken which in turn is subject to judicial review by the Court of First Instance.
See: Commission Regulation (EC) No 773/2004 relating to the conduct of proceedings by the Commission pursuant to Articles 81 and 82 of the EC Treaty [now Articles 101 and 102 TFEU] (OJ L 123 , 27/04/2004 p. 18-24).