(defun nnmail-remove-list-identifiers ()
"Remove list identifiers from Subject headers."
(let ((regexp (if (stringp nnmail-list-identifiers) nnmail-list-identifiers
(defun nnmail-remove-list-identifiers ()
"Remove list identifiers from Subject headers."
(let ((regexp (if (stringp nnmail-list-identifiers) nnmail-list-identifiers