{"description": "A mail server is required for sending emails.\nThe <code>postfix</code> package can be installed with the following command:\n<pre>\n$ apt-get install postfix</pre>", "rationale": "Emails can be used to notify designated personnel about important\nsystem events such as failures or warnings.", "severity": "medium", "references": {"srg": ["SRG-OS-000046-GPOS-00022"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "the package is not installed", "ocil": " Run the following command to determine if the <code>postfix</code> package is installed: <pre>$ dpkg -l  postfix</pre>", "oval_external_content": null, "fixtext": " To install the Ubuntu 22.04 package postfix run the following command:\n\n$ apt-get install postfix", "checktext": "", "vuldiscussion": "", "srg_requirement": " Ubuntu 22.04 must have the postfix package installed.", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "The Postfix package is installed", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/services/mail/package_postfix_installed/rule.yml", "template": {"name": "package_installed", "vars": {"pkgname": "postfix"}, "backends": {}}}