Inbound Email Security Threat
Protect Mail Server from Illegal Relay Attack
What is Illegal Relay Attack?
Illegal relay attacks refer to malicious activities that compromise the security of email servers. In these attacks, the perpetrator illegitimately uses a third-party email server to send bulk spam emails.
- This technique is employed by spam senders to conceal their identity and avoid direct attribution when sending spam.
- As a result, the email server ends up processing an abnormal amount of email traffic, which wastes server resources and degrades the performance of the email system.
- Additionally, the unauthorized use of the email server’s IP address can lead to blacklisting issues, and the email server’s reputation may be tarnished.
Threat Pathways of Illegal Relay Attacks
Detection of Relay Servers
Attackers scan email servers to determine if the target email server allows relaying. A relay server refers to a server that permits email transmission from external sources.
Unauthorized Use of Relay Servers
After identifying relay servers, attackers determine the method to use these servers for sending spam emails. They do this by discovering unauthorized access methods for relay servers or exploiting vulnerabilities in legacy relay servers to use them without permission.
Sending Spam Emails
Attackers send a large volume of spam emails through the unauthorized relay server. They use relay servers to hide their actual IP address and to take advantage of the ability to send spam emails in bulk.
Protect your mail server from illegal relay attacks with SpamGUARD!
Protect your email server from illegal relay attacks and safeguard your organization’s
reputation and security. With SpamGUARD, respond swiftly to illegal relay attacks and
block spam senders. Utilize customized machine learning filtering to block bulk spam emails, enhancing productivity and establishing a secure email environment.
Have you ever experienced your mail server being overwhelmed by a large volume of spam emails?
We are here for your email security.
Counteract illegal relay attacks and more with Mail Inspector Platform!
Analyze Vulnerability through Security Assessment
Assess various email threats to identify weaknesses in the email system.
Prevent Unauthorized Access Attempts to Mail Servers
Prevent unauthorized and illegal intrusion to steal sensitive data in the mail server.
Block Malware Threats Hidden in Malicious URLs
Block harmful actions that lead to malware infection on the user’s device when accessing malicious URLs.
Prevent Unintentional Information Leakage Due to Insider Mistakes Mistakes
Prevent information leakage due to user errors or mishaps, regardless of their intentions.
Protect from Compromised Account Emails
Prevent malicious use of user accounts compromised by attackers to exploit other users’ personal information.
Prevent Intentional Confidential Information Leakage
Prevent users from intentionally leaking sensitive information externally.
Protect from Zero-Day Threats
Prevent damage from new forms of malware threats previously inexperienced.
Prevent Sophisticated BEC Attacks
Block actions where individuals impersonate executives within organization to gain access to internal information.
Block Email Spoofing
Prevent users from intentionally leaking sensitive information externally.
Protect Mail Server from Illegal Relay Attack
Protect from malicious activities compromising the security of the email server.
Detect Attacks Exploiting Email Attachments
Prevent the spread of malware through attachments with malicious intent.
Prevent System Disruption due to Ransomware
Prevent the infiltration of a user’s PC and system encryption through email attachments.
Protect Personal Information from Phishing Sites
Prevent email links from redirecting to malicious sites that extract personal information.
Detect Email Sending IP Route Change
Detect activities such as illegal access to users’ email accounts and identify theft through impersonation.
Analyze Hard-to-Identify Domains
Analyze actions that create domains similar to the original domain to cause harm.