Hello Daniel,
Thank you for writing in. My personal apologies for what happened, this is
not allowed behavior here at Google and this email was mistakenly sent to
you. Mistakes happen but we're sorry that this particular mistake
happened, unsolicited email is not acceptable. If you have any further
questions, please do not hesitate to email us.
Sincerely,
Sam
The Google Base Team
If this means that Google are stopping Google Base spam completely now, more power to them.