To Save User Names Associated with a Process That Enqueues Mail to the mail.log File

1. Edit the MTA Option file.

2. Set the LOG_USERNAME option.

   This option controls whether or not the user name associated with a process that enqueues mail is saved in the mail.log file. For SMTP submissions where SASL (SMTP AUTH) is used, the user name field will be the authenticated user name (prefixed with an asterisk character).