If you receive, or want to receive, VFR list messages in digest mode , do not follow the directions in this section. Whenever you send something to this address, put it in the BODY of the message, not the Subject line. In this day of internet spammers, this is necessary to keep people from subscribing others unwillingly to the list, and to keep spammers off the list. Posted messages are bundled together and sent out as one larger message rather than several smaller ones. Digests are sent out once a day or when a certain number of kbytes has been exceeded.
Same rules apply here as described above.
The note about an auth code applies for getting on the digest version of the list as well. See the Normal Delivery section above for details. You'll have to unsubscribe from one list and resubscribe to the other. That's the only way to do it. Be patient, as these require manual intervention by the list administrator.