There are (still) people who can use networks but can't read Usenet news; for them, not all is lost if they can send and receive email.
The TeXhax digest is operated as a
mailing list. Send a message `subscribe texhax' to
texhax-request@tex.ac.uk to join it.
The mailing list info-tex offers a mail analogue of the Usenet group
comp.text.tex; mail to the list us automatically submitted
to the newsgroup, and thus answers to questions may be given by people
who only read the newsgroup. Subscribe to the list by sending a
message `subscribe info-tex <your name>' to listserv@shsu.edu
The (rather high volume of) postings to comp.text.tex may
be had in digested form through the mailing list ctt-digest.
Subscribe to the list by sending a message
`subscribe ctt-Digest <your name>' to listserv@shsu.edu
Announcements of TeX-related installations on the CTAN
archives are sent to the mailing list ctan-ann. Subscribe
to the list by sending a message `subscribe ctan-ann <your name>' to
listserv@urz.Uni-Heidelberg.de
Issues related to METAFONT (and, increasingly, MetaPost) are discussed on
the metafont mailing list; subscribe by sending a message
`subscribe metafont <your name>' to listserv@ens.fr
Several other TeX-related lists may be accessed via
listserv@urz.uni-heidelberg.de. Send a message containing
the line `help' to this address.
The
literate programming newsgroup
comp.programming.literate is gatewayed to the litprog
mailing list; subscribe by sending a message
`subscribe litprog <your name>' to listserv@shsu.edu.