One way to avoid spam submissions is to make the requirements of your form more complex. This simple change will cause many spammers to fail and not get through to you.
This article will show you how to change field requirements.
Who can use this feature?
System Administrator | Owner | Publisher | Author
Instructions
Navigate to Modules > Content > Form Center
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Select the category that contains your form
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Click Actions next to the desired form
Select Modify
Locate your fields and select a field to change
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Select the Advanced tab
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Note:
Depending on the field, the Advanced tab may not be available
Change the Answer Must Be of Type to a more specific answer

Anything: Accepts all answers
Only Letters: Only accepts letters
Only Numbers: Only accepts numbers
Telephone Number: Only accepts phone numbers
Postal/ZIP Code: Only accepts ZIP code numbers
Email Address: Only accepts email addresses
Currency: Only accepts currency (money) formats
Advanced: More customization is available
Click Save Changes
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Select Save
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