Spamming form on my site

[Jon12345]

I have a simple PHP form on my website at http://www.access-programmers.co.uk/contact2/contact.htm

Some spammer is using that form - I believe - to send out loads of emails. How do I know this? Well, I keep getting these bounced messages:

Mailbot
DSN: failed (Access World enquiry)

This is a Delivery Status Notification (DSN).

I was unable to deliver your message to
[email protected].

I said
  RCPT TO:<[email protected]>

And they gave me the error;
  554 Sorry, no mailbox here by that name. (#5.1.1)

How do I stop this? It is driving me nuts!

 

[Jon12345]

Well, I am also getting this email back which is basically the result of them filling in my enquiry form.

Name: OpaqueNiteIdiot
Position: http://usa-credit-cards.atspace.com/index.html
Company: The Sunset and the Apprentice
Phone: 13131564
Email: [email protected]
Source:
Country:
Type of project:
Notes: Your sites design is really tremendous. Nice work.
http://usa-credit-cards.atspace.com/index.html
<a href=\'http://usa-credit-cards.atspace.com/index.html\'>http://usa-credit-cards.atspace.com/index.html</a>
http://usa-credit-cards.atspace.com/index.html

 

[Jon12345]

I am using my ISP's email and there are no spam or email options on there at all.

I have deleted the Thank You page so the code is still not there anymore. But I am still getting the emails.

Do you think they have taken the relevant details and put it into an application to spam me or something? e.g. taken my email address and required fields.