Large enterprise servers may be more prone to be on blacklists due to a combination of technical, operational and behavioral factors that are closely related to size, the scale and complexity of its infrastructure.
These blacklists, which are maintained by Internet service providers (ISP), email platforms, and other entities that manage the online security, are used to identify and block servers or IP addresses involved in suspicious activities, such as spamming, malware distribution, or participation in botnets.
Below, we’ll explore the reasons why large enterprise servers may be more likely to end up on these lists.
Increased visibility and traffic volume
One of the primary reasons that large corporate servers may be blacklisted is the massive volume of traffic they handle.
Large companies often operate with large amounts of emails, data transactions and inter-server communications.
This makes them a more attractive target for attackers, but also makes their activities more visible to systems that monitor online activity.
When a company runs a large infrastructure, the likelihood of any email or related traffic being malicious or violating policies is increased.
Although many companies implement security mechanisms, threats sometimes go unnoticed among the large number of legitimate communications.
This can result in an IP address from a company server being blacklisted due to the presence of suspicious activity that is detected in mass traffic.
Use of shared IP addresses
Many large companies use shared IP addresses to manage their email and other online services.
These IP addresses can be used by hundreds or thousands of other users or systems.
If one of the users sharing the same IP address is engaged in unwanted activities, such as mass spamming or hacking attempts, the full IP address may be blacklisted.
This can happen without the large company having done it intentionally, since its servers are sharing resources with other clients or applications.
In addition, the use of dynamic IP addresses or third-party service providers may also increase the likelihood that IP addresses are compromised or associated with suspicious behavior.
For example, if a server in a large company is infected by malware and begins to perform unwanted activities without being detected immediately by the company, this can affect the reputation of the IP address and lead to it being blocked.
Insufficient or outdated security
Large companies often have complex security systems, but may also have difficulties keeping them up to date due to the size and diversity of their infrastructure.
The security vulnerabilities in your servers, networks or applications can be exploited by external or internal attackers, which may result in their servers being used for malicious activities, such as spamming or the spread of malware.
Although the company may have security measures in place, proper maintenance and constant supervision are necessary to prevent its servers from being used without your knowledge for illicit activities.
For example, if a server in a large company has a security vulnerability that is not patched in time, an attacker can infiltrate and use it to send unwanted emails (spam) or infect other systems.
This type of activity can cause the server’s IP address to be blacklisted by spam or malware.
High probability of being targeted by external attacks
Large companies are frequent targets of cyber attacks because of their high profile, the value of their data and their technological infrastructure.
Attackers may attempt to compromise company servers through attacks such as phishing, malware, denial of service (DDoS) attacks or exploiting vulnerabilities.
In the event that attackers manage to take control of a company server, it is likely that they will use this server to launch attacks against other targets or carry out illegal activities.
If these compromised servers are spamming, engaging in fraudulent activities or contributing to a botnet, the company may not be aware of this until it is already on a blacklist.
This is particularly common in companies that do not have complete visibility into the activity of all their servers due to lack of comprehensive monitoring or auditing.
Careless handling of IP reputation
Managing the reputation of a IP address is essential to prevent a company’s servers from being blacklisted.
If an email server is misconfigured, has poor mailing list management practices, or does not have properly configured mail authentication mechanisms such as SPF, DKIM and DMARC, your messages are more likely to be marked as spam.
In addition, if a company does not regularly audit its server and network infrastructure, may result in poor communication or security practices that increase the likelihood of a server being flagged as problematic by security platforms.
Use of unwanted marketing techniques
In the context of digital marketing, many large companies often use aggressive email marketing techniques, sometimes using practices that do not strictly follow the best practices of opt-in (prior consent) and opt-out (removal).
Mass email campaigns that are not well targeted or contain elements considered unwanted (e.g., unsolicited promotions, excess affiliate links or excessive advertising content) may lead to company servers being marked as spammers.
Spam filters on email servers, such as Gmail, Outlook, and professional third-party routers or firewalls are designed to identify spam patterns and block them.
If large companies do not properly manage their contact databases and user preferences, their emails may be considered unwanted, increasing the possibility of their servers being blacklisted.
Password compromise and data leakage
Large enterprise servers may be more vulnerable to password compromises or data breaches due to the large number of users and applications they manage.
When an attacker has access to a high-profile email account, such as a system administrator or sales staff member, they can use that account for illegitimate activities.
These activities, such as sending fraudulent emails or inserting malware, can cause the IP address associated with the account to be blacklisted.
In addition, data breaches are common in large companies due to the huge amount of information they process.
If user data, including passwords or contact details, is leaked, attackers can use this information to conduct spam or phishing campaigns from the company’s servers, which contributes to the risk of servers being blacklisted.
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What is the reason that many services experience this inconsistency?
Many of the companies that sell in bulk, have farms of servers saturated with websites, precisely to be able to give such cheap prices. But they are totally neglected, do not know what they have there, there are no rules in the game and many of the users do what they want and violate aspects that are delicate and help to maintain a healthy domain. Like all things in this life.
It happens that many of these IPs are already more than listed in the black lists and no matter how much you try to send an email to a company with a high security It will never reach them and this is not solved unless you look for a clean server and at least in the basic services offered by these companies, you won’t find it.
They will offer you a service, but now much more expensive and will try to sell you, endless applications attached, to keep your domain safe. But many times the clients do not realize that they don’t need all of that, just being on a secure server and being maintained.
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