<snip>

Why not add your old email addresses to the new group you are now with.

That way they benefit anyways.

...he can't join his old addresses to a group without having the passwords
for them. Doesn't matter if it's a new or old group; the accounts have to
join the group, a group owner can't just pull in accounts on their own.

Oops, Sorry - didn't know.

(On reflection it does make sense to require a password as well as user
email address (although not sure on this as SETI users email addresses are
"secret" and known only to SETI@home and the user - hence I would have
thought that passwords would not be entirely necessary).

Thomas