RBL blacklists, What are?
RBL is an abbreviation of “Real-time Blackhole List”. Although it is a common and popular abbreviation, DNSBL (O “DNS blacklist”) It is considered a more accurate technical term.
What is a DNS blacklist?
A DNS blacklist (DNSBL) It is a mechanism to publish a list of IP addresses that some people may want to avoid and in a format that can be easily consulted by programs on the Internet. They are mainly used to publish lists of addresses that it is known that they are involved in spam activities. All mail servers can be configured to reject or mark messages that have been sent from a site listed on one or more than these RBL blacklists.
Blacklists, RBL is an effort to stop email spam. It is one “black list” locations on the Internet with a reputation for sending spam email. Locations consist of IP addresses that are used most often to publish the addresses of computers or networks linked to spam (spam). The majority of mail server software can be configured to reject or mark messages that have been sent from a site listed on one or more than these lists.
RBL blacklists of email are everywhere. There are so many, that it is likely that the IP address of your server appears on one of them at this time. If the IP of your server RBL blacklists of email, He will probably email delivery problems.
There are many tools of blacklists email that included a long list of blacklists RBL realtime DNS-based RBL (DNSRBL). But nevertheless, There are only a few black RBL email lists in which we should really worry.
The rest of them are rarely used, and it is likely that your emails are not affected by them. We are therefore going to explain in greater detail the RBL blacklists that we must avoid at all costs.
Composite Blocking List (CBL)
This list is maintained by Spamhaus. It only shows black lists of IPs that show malicious behavior, as spam bots, dictionary attacks, Open proxies and similar attacks.
Go to CBL Lookup Utility to check if your IP is in the list. If it is so, you will be given the option to request removal.
The process of removing this list is easy. Just send your IP to the Elimination, But if your system continues to send spam, they join again and also quickly.
Spamhaus Block List (SBL)
The Spamhaus SBL list includes email spam operations, supplies and services. They also use spamtraps – e-mail addresses that do not belong to real users. If your server or website is hacked, spammers will often flooded with thousands and thousands of e-mails your system. If a spamtrap of SBL has, the IP of your server will appear on this black list.
THE removal process can vary and sometimes it is not so simple. You can use the Spamhaus Blocklist Removal Center For more details on the process of elimination. The exact process depends on the lists (SBL, XBL, PBL) where is. In some cases, only your service provider, It controls the IP range, You can request removal.
XBL Exploits Blok List
The XBL lists mainly abducted IP addresses. While these are typically a PC, not servers, We sometimes see servers listed in these lists. If a PC is hacked but it uses your SMTP gateway server, or your own server is used as a gateway for spam, the IP of your server can list in the XBL.
It is good to know that the process of removing this list is easy. You can use the Spamhaus Blocklist Removal Center For more details on the process of elimination.
SpamCop It uses mainly spamtraps and spam reports to generate a reputation score. If your score is too low, your IP will be included in your list. Usually, If your IP is on this RBL blacklist, have a security problem. It indicates that a web site or user sends hundreds or thousands of spam messages.
The process of removing this list is automatic. Unlike other providers, There is a process of manually deleting the Spamcop. Since they use a mechanism of rating, eliminate your IP automatically once you stop the source of the spam. Normally the lower in the list occur inside of the 48 hours after the spam stopped.
This is the resource of RBL blacklists that enhance popular devices Barracuda anti-spam. Also made its list available for other use by via Barracuda Central. Many systems web hosting, as cPanel, This list is used by default. Most of the IP addresses listed by sending spam directly to the Barracuda Reputation System detectors. These are honeypots, spamtraps and other systems that allow Barracuda to identify spam sources. As with other lists, their inclusion on this blacklist is often due to a security issue on your server.
The process of elimination is very easy. Just fill out the request for removal, and is usually low in 24 hours.
But by what these black RBL email lists?
Based on research from Return Path, Sendgrid, Proofpoint and other major email service providers, It has been shown that blacklists of email influence the delivery of email to Yahoo!, Gmail, Microsoft and other major vendors. If your IP is in the lists, especially in the Spamhaus lists, you will have big problems of delivery in your emails.
SpamCop & CBL are used by default in many shared like cPanel hosting control panels. Whether it's small business, the safest is to have your e-mail with a shared host using these blacklists of email. WHM / cPanel supports lists of Spamcop and Spamhaus Zen. The list of Zen is an aggregate list of the entire list of Spamhaus, which also includes the CBL.
Barracuda is used by a number of larger firms and email cloud-based security services. If you are doing business with large companies, It may be protecting your email address with a Barracuda device anti spam. Barracuda also makes its list available to others. By that, even if the recipient server is not using your device, they may continue to use your data.
There are websites where you can check if your IP is listed in some RBL blacklists. Some of them are: rblwatcher.com o anti-abuse.org. If you see having delivery problems in your emails is recommended to use these sites to rule out that it is not in RBL blacklists.