{"description": "Set up a relay host that will act as a gateway for all outbound email.\nEdit the file <tt>/etc/postfix/main.cf</tt> to ensure that only the following\n<tt>relayhost</tt> line appears:\n<pre>relayhost = <sub idref=\"var_postfix_relayhost\" /></pre>", "rationale": "A central outbound email location ensures messages sent from any network host\ncan be audited for potential unexpected content.  Tooling on the central server\nmay help prevent spam or viruses from being delivered.", "severity": "medium", "references": {}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "it is not", "ocil": "Run the following command to ensure postfix routes mail to this system:\n<pre>$ grep relayhost /etc/postfix/main.cf</pre>\nIf properly configured, the output should show only <tt><sub idref=\"var_postfix_relayhost\" /></tt>.", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": "package[postfix]", "platforms": ["package[postfix]"], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": ["package_postfix"], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Configure System to Forward All Mail through a specific host", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/services/mail/postfix_client/postfix_client_configure_relayhost/rule.yml", "template": null}