Postfix Install and Test
In order to have mail working properly on APEX, mail must be setup properly.
This note has a lot of information about how I modified linux systems to work with postfix properly.
Postfix Post #1
Configuring mail properly on a linux server is critical for APEX to send mail properly.
Postfix log file location
Configuring Postfix as a Gmail Relay on CentOS
then mail works
directory for rdbms admin stuff