To send mail from a specific sender address change the MONITORING_EMAIL_FROM_ADMINISTRATOR token to true in the site-options.conf file.
CSFE uses the member's email address as the sender address when it delivers the mail. To reconfigure this setting in the site-options.conf file, set the MONITORING_EMAIL_FROM_ADMINISTRATOR token to true, as shown in the following code sample:
MONITORING_EMAIL_FROM_ADMINISTRATOR=true