I'm all to familiar with spam filters, and how they can screw-up your mailbox. Today I had my first experience of a filter which looks through the emails you send to a company and filters out what it thinks they don't want to read.
So, an email to a very well-known website company resulted in an automated response message telling me that my email would not be read and did not appear to be relevant. I obviously didn't include the right keywords for their filter.
Isn't progress wonderful?