Anti-SPAM Software With E-mail Confirmation Feature?

Lately on some of the e-mails I receive it requires me to enter a code based on a picture or to confirm that I sent the e-mail before my e-mail can get to the person.  This seems like a very good SPAM tool.  Anybody know what Anti-SPAM tool or software they are using.  I would very much like to start using it.  I have done some research this morning but can't find it.  I am searching for "E-mail confirmation" so maybe I am searching for it wrong ot it is called something else.   Since I want to add this to my budget today I am going to give quite a few points for a good quick answer.  Thanks.

Sean Odom, CCIE, MCSE
Sybex/Pearson Education Cisco Author
SeanOdomAsked:
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flyguybobCommented:
There are several out there that have this challenge/response scenario:
There are three types:
Local Application (BongoSoft and Zeap make C/R anti-spam software that is local to the workstation)
Hosted (Quordia, spamArrest, and spam-Cop provide hosted C/R anti-spam solutions... sometimes you have to reply or click a web-link (or be manually added) in order to be accepted.)  I use spamArrest for my personal accounts.
Server-Based (Icewarp Merak is an example)  Most of these servers are smart-hosts    (Note that Server-based can mean that they act as a smart-host (Linux, Windows, proprietary).  I haven't found a C/R application that is installed on the the Exchange server (be it Front-End or Back-end)

For whatever reason, the Exchange-based anti-spam vendors have been very slow to adopt C/R based scenarios.  This may be because of patents or because of the Exchange AV API...I do not now.

Many challenge/response solutions surround spam-assassin, a "free" *nix-based application have been developed.  This would be a smart-host or a smart-relay in your present scenario and would require a few configuration changes and some pre-change testing.

One thing to remember is that certain versions of Outlook automatically prevent the automatic display of pictures in messages.  Senders of spam would occasionally imbed clear/transparent pictures to track messages, how long they were open for, etc.

One of the leading products was BrightMail.  Symantec has recently acquired them...it will be interesting to see what becomes of it.

P.S. Is that CCIE the full CCIE?  If so, congrats and nice work.
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flyguybobCommented:
IMHO, the answer was good and covered both server-based challenge-response as well as workstation based (end-user based) C/R.
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