Spam proof mail form

[Mouse]

hi all...

i have just found that a simple mail form i had on my testing site has been used to send spam... so two questions

1... how do they use my form to spam other people?

2... how do i stop the buggers?

GRRRRRRRRrrrrrrrrr!!!!!!!!!!!!!!!!11

Mouse

[kenrbnsn]

Take a look at these articles at the [a href=\"http://www.nyphp.org/index.php\" target=\"_blank\"]NYC PHP User's Group[/a] web site:[list][*][a href=\"http://www.nyphp.org/phundamentals/spoofed_submission.php\" target=\"_blank\"]Spoofed Form Submissions[/a][*][a href=\"http://www.nyphp.org/phundamentals/email_header_injection.php\" target=\"_blank\"]Email Header Injection Exploit[/a][/list]
Ken

[Mouse]

[!--quoteo(post=370309:date=May 1 2006, 05:31 PM:name=kenrbnsn)--][div class=\'quotetop\']QUOTE(kenrbnsn @ May 1 2006, 05:31 PM) [snapback]370309[/snapback][/div][div class=\'quotemain\'][!--quotec--]
Take a look at these articles at the [a href=\"http://www.nyphp.org/index.php\" target=\"_blank\"]NYC PHP User's Group[/a] web site:[list]
[*][a href=\"http://www.nyphp.org/phundamentals/spoofed_submission.php\" target=\"_blank\"]Spoofed Form Submissions[/a]
[*][a href=\"http://www.nyphp.org/phundamentals/email_header_injection.php\" target=\"_blank\"]Email Header Injection Exploit[/a]
[/list]
Ken
[/quote]
makes for a scarey read... i think i'm going to have to reevaluate my mail functions.

has anyone found a solution? would it be feasable to add a limit to how many mails were sent by each IP or email address?

Mouse