What is domain spam?
Posted: Thu Feb 13, 2025 3:51 am
Domain spamming is a common problem today. It is the act of sending unsolicited emails in bulk to many recipients. These emails can be harmful and infect your computer with malicious programs.
To prevent domain spam, email marketers need to get permission from major Email Service Providers (ESP). In this article, we will discuss how to get unblocked quickly and effectively.
Domain spam refers to unsolicited emails sent to a large number of users to promote products or services. These emails are often sent from domains with poor reputations and are listed as malicious or phishing by multiple well-known domains and DNS block lists.
Domain spam blocklists can be divided into IP-based blocklists and domain-based blocklists. Let's take a look at them:
IP-based block lists
Mailbox providers use Real-time Block Lists (RBL) and Domain Name Server Block Lists (DNSBL) to identify if the IP address of the sending server belongs to a sender that allows other servers to connect and send from their system (open relay), a known spammer, or an ISP that allows spammers to use their infrastructure.
SpamCop (SCBL): Includes IPs reported for sending malta phone number list spam to SpamCop users, which are automatically removed after 24 hours if spam reporting stops.
Psbl.surriel.com: Passive Spam Blocking List (PSBL) includes IPs that are not identified as mail servers, allowing whitelisting.
Ubl.unsubscore.com: Lashback's UBL lists senders whose addresses were taken from suppression lists.
Xbl.spamhaus.org (XBL): Focuses on servers with security issues, such as open proxies or servers sending executable viruses, which often indicate that the system has been compromised.
Cbl.abuseat.org (CBL): Lists IPs that act as open proxies or are used for spam/virus propagation, provides self-removal option.
Assessment: Consists of ivmSIP (spam IPs only), imvSIP/24 (entire IP block), and ivmURI (domain-based blocklist) targeting spam sent to real users.
Sbl.spamhaus.org (SBL): This list is managed by volunteer editors and targets senders who have been hit by spamtrap networks, causing a significant impact on their sending capabilities.
Domain-based block lists
These block lists are based on the domain name of the sender's email address. They are used to identify domain names that are known to send spam or have been compromised.
URIBL: Identifies domain names used in spam, with black.uribl.com being key to sending spam; frequently updated and can be removed automatically or upon request by the domain owner.
Dbl.spamhaus.org: A real-time block list of domains found in spam, maintained by automated systems and a global team of members.
SURBL: A list of website domains that have not received spam, and domain owners can apply for removal by initial query and following specific instructions.
To prevent domain spam, email marketers need to get permission from major Email Service Providers (ESP). In this article, we will discuss how to get unblocked quickly and effectively.
Domain spam refers to unsolicited emails sent to a large number of users to promote products or services. These emails are often sent from domains with poor reputations and are listed as malicious or phishing by multiple well-known domains and DNS block lists.
Domain spam blocklists can be divided into IP-based blocklists and domain-based blocklists. Let's take a look at them:
IP-based block lists
Mailbox providers use Real-time Block Lists (RBL) and Domain Name Server Block Lists (DNSBL) to identify if the IP address of the sending server belongs to a sender that allows other servers to connect and send from their system (open relay), a known spammer, or an ISP that allows spammers to use their infrastructure.
SpamCop (SCBL): Includes IPs reported for sending malta phone number list spam to SpamCop users, which are automatically removed after 24 hours if spam reporting stops.
Psbl.surriel.com: Passive Spam Blocking List (PSBL) includes IPs that are not identified as mail servers, allowing whitelisting.
Ubl.unsubscore.com: Lashback's UBL lists senders whose addresses were taken from suppression lists.
Xbl.spamhaus.org (XBL): Focuses on servers with security issues, such as open proxies or servers sending executable viruses, which often indicate that the system has been compromised.
Cbl.abuseat.org (CBL): Lists IPs that act as open proxies or are used for spam/virus propagation, provides self-removal option.
Assessment: Consists of ivmSIP (spam IPs only), imvSIP/24 (entire IP block), and ivmURI (domain-based blocklist) targeting spam sent to real users.
Sbl.spamhaus.org (SBL): This list is managed by volunteer editors and targets senders who have been hit by spamtrap networks, causing a significant impact on their sending capabilities.
Domain-based block lists
These block lists are based on the domain name of the sender's email address. They are used to identify domain names that are known to send spam or have been compromised.
URIBL: Identifies domain names used in spam, with black.uribl.com being key to sending spam; frequently updated and can be removed automatically or upon request by the domain owner.
Dbl.spamhaus.org: A real-time block list of domains found in spam, maintained by automated systems and a global team of members.
SURBL: A list of website domains that have not received spam, and domain owners can apply for removal by initial query and following specific instructions.