Although not all mailing lists are the same, they are similar enough to consider one set of instructions for joining them.
From the Global Schoolhouse: http://www.gsn.org/gsh/lists/
Search for "Educational listservs OR mailing lists "
Subscribe [listname] [your first name] [your last name]
If your name is Jane Doe, and you are subscribing to a mailing list called ElemTcher, then you would type:
Subscribe ElemTcher Jane Doe
Some Mailing Lists
Hilites: Collection of high-quality
classroom-based collaborative learning projects.
Formal Name: hilites
You'll find this listserv and many other great ones at http://www.gsn.org/gsh/lists/
K-12 Administration: For educators
who are interested in issues of K-12 school administration.
Formal Name: k12admin
Library Media Network: A list for
school media specialists
Formal Name: LM_Net
The World Wide Web in Education List: WWWEDU is a moderated discussion with over 1600 members from 35 countries. Formal Name: WWWEDU Address: firstname.lastname@example.org