Unable to determine SMTP server to use: set FND_SMTP_HOST

Outpost Processor has encountered the below error.

This error can be found in OPP logs:
----------------------------------------
[GC 14000K->8905K(20284K), 0.0074280 secs]
ProcessorException: Unable to determine SMTP server to use: set FND_SMTP_HOST
        at oracle.apps.fnd.cp.opp.EmailDeliveryProcessor.deliver(EmailDeliveryProcessor.java:66)
        at oracle.apps.fnd.cp.opp.DeliveryProcessor.process(DeliveryProcessor.java:91)
        at oracle.apps.fnd.cp.opp.OPPRequestThread.run(OPPRequestThread.java:176)
----------------------------------------

Solution:

1. Log into System Administrator responsibility.
2. Navigate to Profile - System.
3. Query up the %smtp% profiles.
4. Set the following profile values to the defined host and port:
FND:smtp Host (Hostname or IP)
FND:smtp Port (Default is 25)

Ref : R12: "PostProcessorException: Unable to determine SMTP server to use: set FND_SMTP_HOST" Error In OPP manager log file When Selecting Delivery Opts in FNDRSRUN to Send Email Notifications (Doc ID 1240768.1)