The EFnet IRC Network RBL is comprised of a collection of data from several sources with the purpose of providing a "one stop shop" for IRC admins to block a multitude of undesirable clients.
Efnet Rbl Reports Shared Hosts
Host-reputation Blacklists will list either single IP Addresses that host multiple domains or entire ranges of IP Addresses from DNS &/or Email Hosts that host email for their registered domains on shared email servers. When one company sends Spam Mail or Unsolicited Bulk Email (UBE), the entire ranges can be reported as blacklisted.
Efnet Rbl Reports Open Relays
Relay/Proxy-based Blacklists typically list email servers and/or hostnames that are sending Unsolicited Bulk Email (UBE) that is clearly from email addresses that are not hosted on the server or that do not match the SMTP Banner/Hostname of the Email Server, commonly referred to as an Open Relay. An Open (Mail) Relay is an SMTP server configured in such a way that it allows anyone on the Internet to send e-mail through it, not just mail destined to or originating from known users.
Efnet Rbl Reports Sources Of Spam
Spam-based Blacklists are those that will list either single IP Addresses or entire ranges that have actually received Spam, i.e. Unsolicited Bulk Email (UBE) in their Spamtraps from an IP-Address. This could be a result of a compromised email account, an Open Relay, or simply sending mass emails / marketing and not following best practices according to the "CAN-SPAM Act of 2003" (ref: https://en.wikipedia.org/wiki/CAN-SPAM_Act_of_2003)
Efnet Rbl Automatically Delists Entries
This blacklist does not offer any form of manual request to delist. Your IP Address will either automatically expire from listing after a given timeframe, or after time expires from the last receipt of spam into their spamtraps from your IP Address.
Efnet Rbl Requires A Manual Delisting Request
This blacklist does support a manual request to remove or delist your IP Address from their database. Please note that removal requests that are submitted without addressing the core problem will likely result in your IP Address or Domain being relisted in that database, which can cause subsequent problems and extended listing periods without release.