There are 8 PEAR-related mailing lists available. Most of them have archives available, and they are also available as newsgroups on our news server. The archives are searchable. The lists are described in more detail in the manual.
You will be sent a confirmation mail at the address you wish to be subscribed or unsubscribed, and only added to the list after following the directions in that mail.
There are a variety of commands you can use to modify your subscription. Either send a message to firstname.lastname@example.org (as in, email@example.com) or you can view the commands for ezmlm here.