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Internet
When speaking of mail server-related security, one tends to limit the issue to message applied security measures, and even more to Antivirus and Antispam protection. This is however only one stage in the more complex process of securing your server. aims at identifying and explaining all security layers, highly important when choosing a certain mail server and consequently when configuring and using it.
We have chosen a multi-stage approach for your mail server securing procedure, each stage addressing one of the security layers we consider relevant: connection-related layer, protocol security, email control parameters (including Antivirus and Antispam applications), and the configuration and management layer (most likely to be affected by human errors).
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When using a newly installed mail server, administrators should first make sure they use secure connections. There are two main possibilities to secure connections: encryption and firewall-like rules.
Encoding methods have continuously been developed as the Internet has become the preferred medium for data transfers. The most commonly used encryption methods are SSL (Secure Sockets Layer) and TLS (Transport Layer Security). However, incorrect usage of encryption often leads to security breaches. Most common examples are web pages containing both secured and unsecured information or communications secured only after login via a plain login page.
Firewall-like rules enforced at server level are recommended to backup an existing Firewall or replace it when one is not available. They can impose limitations both on established connections and on hosted traffic. We recommend creating allow/deny rules both globally (applied to all protocols and listeners) and specifically for each listener in order to prevent attacks such as DOS (Denial of service).
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