On Sun, Sep 01, 2002 at 10:44:30PM -0700, Friedrisch Muller wrote:
> Sorry, I may now get a bit off-topic now... but you
> guys seem to be the right persons to ask about this...
> :)

I've marked the thread OT, but I think you are right ;)

> What do you think about technics to avoid getting into
> the spammers lists?
>
> Is it worth trying to hide your e-mail-address on
> webbpages like
>
> friedrisch at yahoo dot com
> friedrisch yahoo.com

I guess the spambots will get intelligent enough to figure that out soo.

> friedrisch<x>yahoo.com

Do you only want to display the address or do you want to make it
clickable using mailto: links? First helps, but second is more "user
friendly".

Some nice techniques can be found on
http://www.neilgunton.com/spambot_trap/

One idea I am using is listed there too below "Some other interesting
ideas:"

----- snip -----
While working on my new hompepage I found myself asking me how to defend
against those bots. I didn't want to break my eMail-address or to hide
it using javascript or images - especially because my visitors should be
able to use mailto: links as expected.

My provider set up a "catchall" mailbox where all mails are stored that
are sent to my domain example.com. Since I am developing my pages using
PHP I thought of a way to make them unique for each visitor. The result
was the following small function:

function generateMail(){
    global $HTTP_SERVER_VARS;

    // is a proxy in use?
    if ($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]) {
        $ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
    } else {
        $ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];
    }

    return "web-".sprintf("%u", ip2long($ip)).".".time()."example.com";
}

This generates an address in the form

   web-32bitIP.timestampexample.com

This way I can easily reject addresses that were found by bots and are
used for SPAMming. I even know where the bot came from and when. I can
even find them in the webserver-logfiles and analyze their activity.
----- -----

     Balu
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