To join an e-list (also called subscribing), send an email message to
listname-request@cornell.edu
where listname is the name of the list you want to join, including the hyphen and the letter L at the end of the list name.
For the Subject of your message, type the single word
join
Leave the body of the message blank. For example:

You must send this message from the email address where you want to receive the e-list's messages.
A short time after sending this message, you may receive a confirmation request. Follow the instructions in the request (which involves replying to the message or clicking on a web link). The confirmation process helps ensure that only people who want to join a list receive the list's messages.
Please note that you may not be added to the e-list immediately, as lists can be configured in a number of ways:
owner-listname@cornell.edu
where listname is the name of the list you want to join, including the hyphen and the letter L at the end of the list name. For example,
owner-sheep-shearing-L@cornell.edu