-;; This pattern should catch all the common variants. The pattern
-;; also ignores mailing list identifiers sometimes added in square
-;; brackets at the beginning of subject lines.
-(defvar rmail-reply-regexp "\\`\\(\\[.+?\\] \\)?\\(Re\\(([0-9]+)\\|\\[[0-9]+\\]\\|\\^[0-9]+\\)?: *\\)*"
+;; This pattern should catch all the common variants.
+;; rms: I deleted the change to delete tags in square brackets
+;; because they mess up RT tags.
+(defvar rmail-reply-regexp "\\`\\(Re\\(([0-9]+)\\|\\[[0-9]+\\]\\|\\^[0-9]+\\)?: *\\)*"