Spam via email form

How?

[vivalasvegas]

Due to receiving spam emails I replaced my email contact on several websites with a contact form a few months ago. Recently I began receiving a few spam messages a day from the same person. I don't know how they do it but somehow they've automated this process. Any suggestions on how to stop this?

Thanks.

[phranque]

here is one possible implementation:
only allow cookie recipients to submit the form and only allow one submittal until the cookie expires.
set the cookie expiration for a reasonable period according to your situation.

[bill]

Look into adding a CAPTCHA [google.com] system to your forms.

[carfac]

Got an IP address- ban the IP!

I also had a repetitive message via e-mail forms. I put a patern match into the e-mail cgi to kick out the e-mail...

[fiu88]

I've been seeing it too ...driving me crazy....SQL injection I believe