Unable to determine SMTP server to use: set FND_SMTP_HOST

Outpost Processot has encoutered 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
FND:smtp Port

The Output Post-processor is running but has not picked up this request.

OPP Error in the Log file:

------------------------------------------------------------------------
The Output Post-processor is running but has not picked up this request.
No further attempts will be made to post-process this request, and the request will be marked
with Warning status.
Setting the profile option Concurrent: OPP Response Timeout to a higher value may be necessary.
------------------------------------------------------------------------

Solution:

A) Restart the Output Post Processor and re-test the issue

B) If the above ddint solve your issue, Increase the below profile options and re-test the issue

Concurrent:OPP Process Timeout to 600 (300*2)

Concurrent:OPP Response Timeout TO 240 (120*2)

C) If A and B didnt work, Increase the procesess of the Outpost Processor (double it i.e if you have 1 increase it to 2) from Concurrent - Manager - Define screen

and restart the OPP, That should resolve this issue.