LOVEJOY-D is the digest mode, while LOVEJOY-L is the list mode which sends each message as it is posted.
To subscribe to or unsubscribe from LOVEJOY-D, send a message to LOVEJOY-Demail@example.com that contains in the body of the message the command either "subscribe" or "unsubscribe" without the quotes, and no other text. No subject line is necessary, but if your software requires one, just use unsubscribe in the subject, too.
The same works for LOVEJOY-L, send the command "subscribe" to LOVEJOY-Lfirstname.lastname@example.org.
To contact the list administrator, send mail to LOVEJOYemail@example.com.