Nowadays, under the significant threat of hacker and virus technology, and for the security of commercial and policy information, many government agencies, military units, financial and insurance institutions, high-tech enterprises, and large corporations have begun implementing tiered management for important data. For example, restricting internet access for different positions and limiting the external dissemination of documents. Among these measures, the email system, as the core information circulation tool for corporate offices, can utilize an internal-external network isolation deployment to achieve security control over confidential information. Below, using the U-Mail email system as an example, we will break down in detail the working principles and advantages of an isolated internal-external network mail system.
1. Hardware Requirements Since this involves using a network gap isolation setup, at least one terminal server is needed for deployment on the internal and external networks. This is the basic hardware requirement; as for specific hardware configurations, each enterprise can choose according to its needs.
2. Deployment Diagram
As shown in the diagram below, the U-Mail email system is deployed separately on the internal and external networks, operating correspondingly without interfering with each other. The two networks are isolated by a network gap device. Network attacks can only reach the external gateway and cannot cross the gap to invade the internal network system. If the external mail system malfunctions due to viruses or other reasons, promptly closing the network gap allows the internal mail system to continue operating normally without interruption, ensuring zero loss of various information data stored on the internal network.
After opting for the U-Mail internal-external network mail system isolation deployment solution, the enterprise’s information security advantages are mainly reflected in the following aspects:
1) Mailbox Account Access Restrictions, Non-Interfering Mail Systems
Because this consists of two mail systems built on different networks, users are assigned based on the information security level involved. Users of the isolated internal and external mail systems do not interfere with each other and cannot communicate. This satisfies the business email needs of different groups while ensuring the absolute security of confidential information within the internal mail system.
2) Better Spam and Virus Filtering
The U-Mail email security gateway can intercept over 98% of spam and virus emails, performing comprehensive scans on all email data including subjects, bodies, attachments, and sources. It analyzes the intent of suspicious emails and promptly implements countermeasures, effectively protecting user mailboxes from spam and virus nuisances. The internal mail system operates within the internal LAN, making it immune to external spam and virus intrusions, thus reducing the number of potential spam and virus attacks based on the recipient count.
3) More Flexible Mail Monitoring and Auditing
Even under internal-external network isolation, U-Mail’s mail monitoring and auditing function allows for custom configuration of monitoring and auditing conditions for each mailbox user based on requirements (such as keywords, sender/receiver addresses, subject, content, etc.). All emails meeting the monitoring conditions are automatically backed up to a specified monitor’s mailbox, while emails meeting auditing conditions must first be delivered to a designated auditor’s mailbox for review and can only be sent externally after approval.
4) Comprehensive Email Archiving
Whether the mail server is deployed on the internal or external network, U-Mail can achieve synchronous backup and comprehensive archiving. Even if emails are deleted, they can still be easily retrieved in U-Mail’s backup folders by criteria for viewing, copying, restoring, and other operations, without worrying about the loss of important emails due to the internal-external network separation.
In summary, for high-security enterprises, internal-external network isolation deployment brings greater security and convenience in ensuring confidential data security, preventing external network virus attacks, and transferring internal information resources. The U-Mail mail server, with thirteen years of industry experience, serves large and medium-sized enterprises and institutions in various fields such as government, education, and finance. Its technical expertise in mail system management design is quite comprehensive and proficient, and it can also provide optimal mail system solutions according to different enterprise needs.
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