>Can anyone explain the subject line "vanagon digest"
I think the listserv software can either send the messages to a subscriber
one-by-one, or in a "digest" form, where a whole day's worth of messages
are combined into a single email with the "vanagon Digest - (etc)" title.
If someone replies to one of the messages contained in the digest, the
reply will have the "vanagon Digest" title as a default if the person
replying doesn't change it to the title of the particular message in the
digest he's replying to.

At least I think that's how it works.