So instead of blaming the RBL, it’s best to fix the issue at your end and re-monitor the listing. If you are listed in any of the RBLs it is most likely that there is an issue with your email. Tips to avoid being listed on RBLīelow is the list of points that could be helpful to avoid your IP address being listed on RBL as a bad sender of email 1. Some of the RBLS services also work with ISPs and setup automatic probes to detect mass mailings and where it is originating from and this can also trigger a red flag that can have your IP blacklisted. If your company or your client’s company sends out bulk emails such as newsletters or mass e-mailings of some sort then chances are one of these e-mails may have been reported to the RBL by someone who thought it was spam. Viruses, spyware, Trojans can also be causing a workstation on your network to send out spam e-mails. There could be many reasons why your IP address got listed on the RBL list. Hence, the best action you can take is to find the root cause of the listing and remove this cause otherwise your IP address will be listed on one or the other RBL. Note that if again there is another case of spam abuse from your IP address then probably your IP will be again on the RBL. Once you have requested for delisting of the IP address, it would generally take a few hours for it to get delisted. RBL generally provides you the time of listing and the reason for listing your IP address, this will be helpful for you to detect what in your email server caused the blacklisting. ![]() Visit the RBL website that has blacklisted your IP/domain and find a link there that would allow you to request removal from the blacklist. To delist your IP address, first check which RBL is listing your IP. ![]() To check if your IP or domain is listed on RBLs, you can do a real-time check at websites like (refer below screenshot) or If your IP address is not listed then its fine but if it is listed, then the first thing you want to do is to get your IP address delisted. Most anti-spam filters query RBLs and if your IP address is listed in one of the RBLs then these filters may not allow your e-mails to go through and block them as spam. If your IP address is listed in an RBL then the chances are that the emails that you send from your server/network to your clients can get blocked even though it may not be spam. Is your IP address listed on RBL lists?Īs an email administrator for your company or your clients, it’s important for you to know if your email server IP is listed on any of the RBL blacklists. If you have a specific type of requirement you can choose the RBL that suits your needs. I have been using Spamhaus RBL for a few years now and have found this list very reliable RBL list for blocking spammers, I would recommend the same. You can test and use the most appropriate one for your email server. If you are the one responsible for email administration, you can set up RBL or DNSBL check on your email server to avoid email, spammers. How long does a listing last? Are they automatically expired, or only removed manually? What can the operator of a listed host do to have it delisted? How does the DNSBL discover addresses to list? Does it use nominations submitted by users? Spam-trap addresses or honeypots? What does the DNSBL seek to list? Is it a list of open-relay mail servers or open proxies – or of IP addresses known to send spam – or perhaps of IP addresses belonging to ISPs that harbor spammers? DNSBL policies differ by the following three major points: The various DNSBLs have different policies. The goal here is to block all IP traffic. Some ISPs, though, will choose to reject IP packets at their routers. If the IP address matches the one on the RBL blacklist, then the connection gets dropped before accepting any traffic from the spammer. The recipient will check RBL for connecting IP address. The blocking occurs during the SMTP connection. Once subscribed to the RBL, ISPs and companies will know from which IP addresses to block traffic. ![]() RBL lists server IP addresses from ISPs (Internet Service Providers) whose customers are responsible for sending spam (knowingly or unknowingly) and from ISPs whose servers are compromised for spam relay. RBL or DNSBL is a mechanism that publishes IP addresses of spam-sending servers. RBL is the short form for “Realtime Blackhole List”, this is a popular term and another technical term with the same meaning is DNSBL or DNS blacklist.
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