f.e.:
// List of active plugins (in plugins/ directory)
$rcmail_config['plugins'] = array(
"webcalendar",
"help",
"compose_addressbook",
"wrapper",
"globaladdressbook",
"keyboard_shortcuts",
"new_user_dialog",
"automatic_addressbook",
"forward_as_attachment",
"tinymce",
"remember_splitter",
//"debug_logger",
//"dblog",
"vcard_attach",
"vcard_attachments",
"sound_notifier",
"terms",
"remember_me",
"captcha",
"taskbar",
"listcommands",
"moreuserinfo",
"demologin",
"impressum",
"contactus",
"sendmessage",
"dnsbl",
"hmail_login",
"hmail_autoban",
"hmail_password",
"pwtools",
"hmail_autoresponder",
"hmail_forwarding",
"hmail_signature",
"accounts",
"register",
"limit_recipients",
"contextmenu",
"lang_sel",
"listcontrols",
"archivefolder",
"msglistcols",
"checked_identities",
"settings",
"savepassword",
"newuser",
"subscriptions_option"
);