January 20, 2003: If you are a COMCAST customer and are seeing messages that your IP address is on the MAPS DUL, please contact COMCAST directly. You may also want to review this page as well.

If you are a mail user with a standard mail client (such as Eudora, Pegasus Mail, Netscape Mail, or Outlook Express) and you can't send mail because your IP address appears on the MAPS DUL, it is probably because your mail program is set to use a mail server other than the one your current Internet access provider provides you. Most ISPs usually prevent this type mail relay with their own anti-relay software, but depending on their configuration they may check the MAPS DUL before they check for unauthorized relay.

If you use a mail (SMTP) server on your own computer, or you share your Internet connection with several other people on a local network with a proxy server such as Whistle's InterJet, and you can't send mail because of this list, it is because your recipients cannot tell the difference between your legitimate mail delivery and a spammer's trespassing on their equipment. However, there is a very easy way to work around the MAPS DUL and get your mail through, and it may even speed up your mail in the process.

How to start sending mail again
If you use a standard mail client, ask your ISP (Meaning the ISP you are using at this moment, if you use more than one) what its outbound mail, or SMTP, server name is. Then change the Outbound or SMTP server setting in your mail program to that name. You should be able to send mail after that. If you use more than one ISP, you may need to switch your SMTP server setting back and forth, or one of your providers may allow access through special means, such as checking mail before sending or using some form of authentication (SMTP AUTH).