Tonythijs on "[Plugin: PayPal Donations] email address appears instead of merchant ID"

Hi,
I installed paypal donations (by Johan Steen) on openmarketingfoundation.nl to use with my premier paypal account. I entered my paypal merchant ID. Instead of the ID my email address is appearing after clicking the payment button. That will generate lots of spam.
I called PayPal support and they stated that the problem is not with PayPal and that I should contact the maker of the plugin.
Any solution is very welcome
Kind regards,
Tony Thijs

http://wordpress.org/plugins/paypal-donations/