Aggressive e-mail filtering
Gated e-mail communities
Don't filter out, filter in!
The advenge SMTP server blocks all e-mail except that which has been pre-approved by the recipient.
The advenge sender database is a unified challenge-response system in which senders are responsible for setting the level of security used to authenticate themselves. It can be used to solve the SPF roaming user problem. (By default, the advenge sender database uses SPF, but it overridable per-sender.)
free demonstration forwarding addresses are available at www.pay2send.com
Project status: Advenge server has available for licensed installation on client systems since 2004. Sender-pay features are not yet in production. Fill out the feedback form below for details.
the word "advenge" is a trade and service mark of TipJar LLC