I’d like to share some information about spam filters in connection with an issue that Dale Delph, of The Mayor’s Inn, brought up about e-mail addresses, in response to the article, “Does Your Website Have the Credibility it Needs?”
Spam filters use complicated algorithms when determining whether an e-mail is spam. Most of the time, they are correct, but often, they are not. This is why most spam filters offer the ability to adjust their settings. If you notice a valid e-mail is being held as spam by your spam filter, you should be able to set the filter to always allow e-mail from this address (or even all addresses from that particular domain) to not be filtered. This also works in reverse. When spam gets through the filter, you should also be able to set the filter to block all mail from this address (or from all addresses from this domain). We strongly recommend people who have spam filters to check these filters as least once a week to ensure that no valid e-mails are being caught in the filter, and to make necessary adjustments to the settings.
Greg Yoas – Blizzard Internet Marketing, Inc.

