RBLs: Real-Time Block Lists (Blacklist Spam Filterin)
RBLs are lists of IP addresses that have been identified by various 3rd party Spam-list maintainers as being sources of Spam. RBLs are a highly effective means for reducing levels of Spam — however, they can lead to potential issues.
For instance, if two users send email from the same mail server (e.g. the same Internet Service or Hosting Provider), and one of the users is sending Spam, the entire mail server can be blocked based on the Spamming activity of a single user. As a result, legitimate users are penalized due to the server IP address being blocked. RBL testing can be very effective, yet legitamate senders can be blocked due to "false positives."
If you receive a bounce-back message from a domain hosted by FastWebEngine the following information may apply. Please contact your intended recipient to have them submit a white list request for your email address or domain.
Read Your Bounce-Back Header (Learn Why Your Message Has Been Blocked)
- If you have tried to send a message to an email account hosted by FastWebEngine and received a bounce back message, review the message in the bounceback and/or email header for additional information.
- If you are an FastWebEngine hosting client and you find that you are unable to receive messages from a specific sender, ask them to review the message in the bounce back and/or email header for additional information.
If a particular message is blocked due to an RBL, the header will provide the name of the RBL and a link to follow to correct the issue. Typical header messages include information regarding the RBL that has blocked the message.
Header Messages For Blocked E-mail (Bounce-Back Messages Senders May Receive)
- Email blocked by SPAMHAUS - to unblock see www.spamhaus.org
- Email blocked by BARRACUDA - to unblock see www.barracudacentral.org
- Email blocked by SPAMCOP - to unblock see www.spamcop.net
