RBL is a dynamic, real-time list of IP addresses that are active spammers (intentional actions) or accidental sources of spam. A blacklist based on domain names is called a DNSBL (Domain Name System Blacklist).
The vast majority of email service providers check the presence of domains and IP addresses on such lists and, if noted, reject the message at the server level or accept it, while marking it as SPAM. Administrators of receiving servers use RBLs for spam filtering to be checked during message delivery and set their own rules based on which the message is rejected or the opposite- whitelisting i.e. marking the sender as trusted and delivering the message.
The primary purpose of Blacklists is to stop a huge amount of unsolicited correspondence, which otherwise would get to our mailboxes, that is fighting spam.
Spam is simply unwanted messages. Many people define that way all emails which are not important to them – even newsletters, although such emails are usually sent to us correctly (we agreed to subscribe). Spam is usually messages that we do not expect and that was sent without our prior consent. It also includes potentially harmful emails – e.g. those that may trigger to perform a specific action (going to a false website or making a transfer) at the same time deceptively resembling a trusted sender (phishing) or containing e.g. malicious software.
Many vendors have their internal IP block Blacklists, but the most commonly used are publicly available lists prepared by companies specializing in this. Below are examples of some of the most popular ones:
Check to see if your domain or IP address is on one of the above or other known lists via the Mailchecker.net tool.
First of all, check which RBL the listing applies to. Many senders are present on various lists, but in the case of smaller ones, this should not have a major impact on deliverability – they are usually not verified by global ISPs. A listing may be temporary and our IP address may disappear from such a list after some time. However, if your IP has been added to one of the larger, aforementioned global lists, you should first determine the cause, then eliminate it, and finally, contact the lists’ support and submit a request for de-listing.
If you are using a third-party tool or cloud servers like EmailLabs™ – contact the Support Team who can help you check your presence on blacklists and remove you from those that allow it.
Many RBL IP lists provide a dedicated form on their site, others require you to send an email and justify why you should no longer be listed. Some lists will only accept your removal request after you make payment. There are also unreliable lists that do not allow any contact to remove entries.
Removal IP blocks from a blacklist usually takes several hours. However, bear in mind that if you re-enter an RBL list, the delisting process may not be as easy as the first time and may even result in your application being rejected.
Your IP address or domain name have been blocked and now is on the BlackList? First of all, don’t panic! It doesn’t mean you’ve ruined your chances of good deliverability. Verify what was the reason for the listing and try to correct it. For most RBLs, this is a reversible process. However, make sure you don’t end up on it (again).
Use a service like EmailLabs™ that provides a wealth of information about your mailings through an easy-to-use analytics dashboard. If you have any questions, please contact our Support Team.
Gmail has announced significant changes in the requirements for email senders to maintain a good reputation and proper classification of messages in user inboxes starting from February 1, 2024....
Vercom S.A. public joint-stock company to which the EmailLabs project belongs, has been assessed and certified to be compliant with the ISO/IEC 27001 and ISO/IEC 27018 standards. The Vercoms’...
The increasing number of phishing attacks each year, and the projection that this trend will continue to escalate, aren’t likely to astonish anyone. This can be attributed, in part,...
Out of all the things that can go wrong when sending out marketing emails, having your emails end up in the recipient’s spam folder is arguably the most dreaded...
Email Authentication, Security
DMARC is an email authentication protocol that is designed to give domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing. Spoofing occurs...
With the emergence of the Covid-19 pandemic, many brands have been challenged to adapt in a short period to the changed reality and new consumer attitudes. That meant reorganizing...
Google and Yahoo's Requirements
2024 marks a turning point in the fast-paced world of email deliverability, as this is the year when Google and Yahoo updated their sender requirements. With the enforcement period...
Best practices, Email Marketing
B2B email marketing – it’s a term you’ve likely heard before, but what does it really entail? And, more importantly, how can it be done effectively? In this article,...
Deliverability, Sending Reputation
Email sender reputation is one of the most important factors that can determine whether your emails reach the intended recipient or not. So, what is the email sender reputation,...
Google and Yahoo's Requirements
2024 marks a turning point in the fast-paced world of email deliverability, as this is the year when Google and Yahoo updated their sender requirements. With the enforcement period...
Best practices, Email Marketing
B2B email marketing – it’s a term you’ve likely heard before, but what does it really entail? And, more importantly, how can it be done effectively? In this article,...
Deliverability, Sending Reputation
Email sender reputation is one of the most important factors that can determine whether your emails reach the intended recipient or not. So, what is the email sender reputation,...
Email Authentication, Sending Reputation
In the realm of email, sender authorization is a powerful tool wielded by local and global providers like Gmail, Yahoo, and AOL to combat spam. Additionally, as an authenticated...
As an integral part of your email infrastructure, SMTP and SMTP port numbers are not just for tech whizzes – they’re important for anyone using email. You’ve likely heard...
Ever wondered why you can’t attach a movie to an email? Or why won’t that PowerPoint presentation just send? It all comes down to the maximum size of email...
One of the most dire situations a business can face is unauthorized access to its company network. This breach can lead to the theft of valuable intellectual property and...
The Simple Mail Transfer Protocol (SMTP) holds significant importance in the realm of email communication. As a vital component of mail servers, SMTP takes charge of sending, receiving, and...
The significance of email protection and data security is growing exponentially in today’s digital world, with StartTLS emerging as a key player in this arena. As an encryption protocol...