Apparently it's the only opt-in system that SpamHaus
will acknowledge.
http://www.spamhaus.org/mailinglists.html
----
Date: 2004-12-22 17:31
Sender: blindman1344
Logged In: YES
user_id=780595
I currently store the date they subscribe. I do not store
the time or IP address. I suppose that's easy enough
to add...
Date: 2004-12-22 16:32
Sender: adarkling
Logged In: YES
user_id=619893
Basically it is Double Opt-In, but there has to be a record
of the verification.
At first I thought that it would have to be a copy of a
reply email, but another page
(http://www.spamresource.com/archives/closedloop.html)
shows
that all we have to do is collect some sort of identifying
information, like date/time and IP address.
Date: 2004-12-22 08:31
Sender: blindman1344
Logged In: YES
user_id=780595
If I understand it correctly, the module already has
support
for it. Try looking at the "Double Opt-In" option in the
module.