Why didn't I get an answer to my question?

We attempt to answer all questions but sometimes the email bounces back.  It is essential that we have a valid email address to send you an answer.  Before you submit your question, please verify that your email address is correct and in the correct format (e.g. xxx@yyy.com).  Replies can bounce because of incorrectly entered email addresses and because email from us is blocked by a firewall or email preferences (e.g. on AOL).