This was hidden at the end of Steve's mail headers:
SL Baur <steve(a)xemacs.org> writes:
[Note: the 21.0 tarballs intended for release are on the FTP site in
ftp://ftp.xemacs.org/pub/xemacs/xemacs-21.0/
ftp://ftp.xemacs.org/pub/xemacs/packages/ ]
--X-Didier: verna