Bulk mailers that do not require confirmed opt-in from their customers, or that have allowed known spammers to become clients and abuse their services -- If you tried to send email and it was REJECTED with an error message that pointed to this page, then the IP address of your outgoing mail server is on our local blacklist. To see if you are on the SpamGuard list (or many of the other lists), go to this URL: http://relays.osirusoft.com/cgi-bin/rbcheck.cgi and enter your IP Address/Domain. If you run a mail server and need help in securing it, then please go here: http://mail-abuse.org/tsi/ar-fix.html for more details.