It is free & open to all interested parties.
Just send the command "subscribe" In The Body of the Message to OKLCGS-Lfirstname.lastname@example.org
Send the command "subscribe" In The Body of the Message to OKLCGS-Demail@example.com
Send a message to OKLCGS-Lfirstname.lastname@example.org that contains (in the body of the message) the command unsubscribe and no additional text.
(several postings are combined and sent to you together as a single large message).
There are two steps.
Send The Command "unsubscribe" to OKLCGS-Lemail@example.com to discontinue mail mode.
Send the command "subscribe" to OKLCGS-Dfirstname.lastname@example.org to start receiving digests.
It will then be sent on to everyone in both mail and digest mode. You don't need to send it explicitly to both.