I see this bug, and a few others, were reassigned to autoconf. autoconf does not use debbugs to track bugs, so the autoconf package has no maintainer address, causing mails to end up on the help-debbugs list.
https://debbugs.gnu.org/cgi/pkgreport.cgi?pkg=autoconf Ref eg https://lists.gnu.org/r/help-debbugs/2017-11/msg00001.html
