Configuring Oracle Application Express to Send Email

Manage Instance --> Instance Settings --> Email

Application Express Instance URL : https://apex.oracle.com/pls/apex/
Application Express Images URL: https://apex.oracle.com/i/
SMTP Host Address :localhost
SMTP Host Port : 25
SMTP Authentication Username : ADMIN
SMTP Authentication Password : abcdefghijk
Use SSL/TLS : No
Default Email From Address :
Maximum Emails per Workspace : 1000