ORA-29278: SMTP transient error: 421 Service not available

 Hi,

I am working in oracle applications 11i on database 9i on Solaris 9.

I am have a procedure that sends email from/to our mail server, when I compile the procedure I get the following error:

ORA-29278: SMTP transient error: 421 Service not available
ORA-06512: at line 25

do i need to add the entry

IP address mail server host anywhere in the database server?

If yes, the path will be appreciated.

or what else do I need to check?

thanks...