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There are no capabilities directly in HTML DB to ascertain if the SMTP service is available. Additionally, there are no facilities to determine if the SMTP server in the Environment Settings is properly configured as an SMTP server or valid relay host.
If using a Unix/Linux server, I typically telnet to the machine and issue the mail command as a test, as in:
mail -v -s "FooBar" email@example.comWith the verbose flag specified, I get feedback on the conversation with the SMTP server.
Go to Control Panel->Add or Remove Programs->Click on
Add/Remove Wndows Components
Check IIS check box.
Select Internet Information Service (IIS) option and click on Details button
Check whether SMTP Service is checked or not.
If not selected then select SMTP check box.
This process should be done on server.
It will help out from ORA-29278: SMTP transient error: 421 Service not available