Simple Mail Transfer Protocol (SMTP) credentials are needed to send email through Email Delivery. The SMTP credentials are used for SMTP authentication with the service. The credentials never expire. A user can have up to 2 SMTP credentials at a time.
Note: The credential set is always an Oracle-generated SMTP user name and password pair; you cannot designate the SMTP user name or the SMTP password.
For more information, see Managing User Credentials.