Auditd service fails with : " Email option is specified but /usr/lib/sendmail doesn't seem executable "

Issue

• After starting the audit service, audit files are generated but getting below mentioned error.

  # journalctl -u auditd
  
  Dec 21 12:18:04 localhost systemd[1]: Starting Security Auditing Service...
  Dec 21 12:18:04 localhost auditd[781]: Email option is specified but /usr/lib/sendmail doesn't seem executable.
  Dec 21 12:18:04 localhost auditd[785]: audit dispatcher initialized with q_depth=2000 and 1 active plugins
  Dec 21 12:18:04 localhost auditd[785]: Init complete, auditd 3.1.2 listening for events (startup state enable)
  

• Found below logs in /var/log/messages :

  Nov 29 05:11:45 localhost systemd[1]: Starting Security Auditing Service...
  Nov 29 05:11:45 localhost auditd[1686]: audit log is not writable by owner
  Nov 29 05:11:45 localhost auditd[1686]: Email option is specified but /usr/lib/sendmail doesn't seem executable.
  Nov 29 05:11:45 localhost auditd[1688]: Audit daemon rotating log files
  Nov 29 05:11:45 localhost auditd[1688]: audit dispatcher initialized with q_depth=1200 and 1 active plugins
  Nov 29 05:11:45 localhost auditd[1688]: Init complete, auditd 3.0.7 listening for events (startup state enable)
  Nov 29 05:11:45 localhost systemd[1]: Started RPC Bind.