If your email was refused with a message referring to this web site then the server that attempted to deliver your email has a backscatter problem and you need to contact your server administrator in order to get the problem fixed.

The Backscatter Problem:
When a mail server accepts a message and later decides that it can't deliver the message, it then tries to send back (bounce) the email to the sender's email address. These bounced emails are often misdirected because the original sender of the message used a forged email address in an effort to avoid detection for purposes of sending out (spam) junk mail.

Backscatter is usually caused by proxy servers, spam filters, firewalls and anti-virus systems running in front of the local network's email servers for the purpose of attempting to weed out spam and viruses. This can be and often is a big problem for other networks if these emails are simply deflected as either spam or unknown users, and then bounced to the mailboxes of third party innocent victims because the original sender spoofed the victim's email address or domain name.

Since almost all spam and mail-borne viruses use a forged sender's address, bouncing it back to the forged sender (victim's) address only results in sending unwanted and burdensome mail to innocent third parties. For this reason the receiving server should either reject the email at the SMTP connection with a 5xx message, silently discard it (once the firewall identified it as spam or unknown user), or file it in a quarantine area for the recipient to view if he or she so chooses. In any event bounced or rejected email should *NOT* be someone else's responsibility when that someone was never involved in the sending process in the first place.

The Solution:
Upgrade and/or configure your mail server and spam filtering software so that this situation is never encountered. Configure your software to either reject messages during delivery or accept them permanently. Do not let your software make choices about delivery once it has accepted a message and already closed the SMTP connection.

If you must accept delivery before you know the status of a message, then file it internally - do not send, forward or bounce it outside your Local Area Network (LAN). Once your software has accepted the email and the SMTP connection has closed, the errant message should then be placed in a special folder or routed to your postmaster. It should  never be bounced to the mailbox of an  innocent third party victim.