texhax
via its
mail list management page.
The French national TeX user group, Gutenberg, offers a Metafont (and,
de facto, MetaPost) mailing list, metafont@ens.fr: subscribe to
it by sending a message
subscribe metafont
to sympa@ens.fr
(Note that there’s also a MetaPost-specific mailing list available via the TUG list server; in fact there’s little danger of becoming confused by subscribing to both.) Announcements of TeX-related installations on the CTAN archives are sent to the mailing listctan-ann
. Subscribe
to the list via its MailMan web-site
https://lists.dante.de/mailman/listinfo/ctan-ann; list archives
are available at the same address. The list archives may also be
browsed via http://www.mail-archive.com/ctan-ann@dante.de/, and
an RSS feed is also available:
http://www.mail-archive.com/ctan-ann@dante.de/maillist.xml
This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=maillists*