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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.
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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.
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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.
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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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