I am using your plugin on a site where wp e-commerce and contact form 7 plugins are used. Buyers purchase using the above e-commerce plugin
where payment is made through Paypal.
I have received complaints for being obstructed to complete the transaction once they come back from Paypal after making the payment which prevents them from completing the transaction. I am sure they won't be using any spam data when they are making payment.
The email address domains used for these transactions are