OL09-00-000290 - OL 9 must have the s-nail package installed.

Information

The s-nail package provides the mail command required to allow sending email notifications of unauthorized configuration changes to designated personnel.

Solution

Install the s-nail package with the following command:

$ sudo dnf install -y s-nail

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Linux_9_V1R4_STIG.zip