On Sun, 23 Jul 1995, Lazlo Nibble wrote:
> I've been mulling the issue of mailing-list address verification for a while.
> If it's important enough to people, we could certainly design some sort of
> key-passing mechanism into the signup procedures for some mailing lists
> -- for example:
> Potential subscriber makes subscribe request;
> List server replies with list charter and an arbitrary key built from
> the potential subscriber's address, the time of day, and a special
> password set by the list manager on the server end;
> Potential subscriber must reply with this key within some arbitrary time
> period in order to join the list.
I have seen something like that on some listserv lists. When you
subscribe it sends a message back to you and before you can join the list
you have to reply with just the word ok. It is very easy to do since it
is just "reply" and then ok, but does require a valid e-mail address.