UTL_SMTP fails: SMTP transient error: 421 Service not available

Question

Hi!
I´m trying to set up database to be able to send emails by UTL_SMTP package.
I´m working whit Oracle 9.0.2.0.7 on Windows 2003 Server EE SP1
For this, I have searched a script of the many on the network. One like this:
CREATE OR REPLACE PROCEDURE CASIUS.SEND_MAIL(SENDER IN VARCHAR2, RECIPIENT IN VARCHAR2, SUBJECT IN VARCHAR2, MESSAGE IN VARCHAR2) IS
    MAILHOST CONSTANT VARCHAR2(3000) := 'server.exchange.test.com';
    MESG VARCHAR2(30000);
    MAIL_CONN UTL_SMTP.CONNECTION;
    BEGIN
        UTL_SMTP.QUIT(MAIL_CONN);
        MAIL_CONN := UTL_SMTP.OPEN_CONNECTION(MAILHOST, 25);
        UTL_SMTP.EHLO(MAIL_CONN, MAILHOST); 
        UTL_SMTP.COMMAND( MAIL_CONN, 'AUTH', 'LOGIN ');        
        UTL_SMTP.COMMAND( MAIL_CONN, UTL_RAW.CAST_TO_VARCHAR2( UTL_ENCODE.BASE64_ENCODE( UTL_RAW.CAST_TO_RAW( '[email protected]' ))));
        UTL_SMTP.COMMAND( MAIL_CONN, UTL_RAW.CAST_TO_VARCHAR2( UTL_ENCODE.BASE64_ENCODE( UTL_RAW.CAST_TO_RAW( 'testpassw')))); 
        MESG := 'Date: ' ||
        TO_CHAR( SYSDATE, 'dd Mon yy hh24:mi:ss' ) || CHR(13) || CHR(10) ||
        'From: <'|| SENDER ||'>' || CHR(13) || CHR(10) ||
        'Subject: '|| SUBJECT || CHR(13) || CHR(10)||
        'To: <'||RECIPIENT || '>' || CHR(13) || CHR(10) || MESSAGE;
        UTL_SMTP.EHLO(MAIL_CONN, MAILHOST);
        UTL_SMTP.MAIL(MAIL_CONN, SENDER);
        UTL_SMTP.RCPT(MAIL_CONN, RECIPIENT);
        UTL_SMTP.DATA(MAIL_CONN,MESG);
        UTL_SMTP.QUIT(MAIL_CONN);
    EXCEPTION
        WHEN OTHERS THEN
        RAISE_APPLICATION_ERROR(-20004,SQLERRM);
END SEND_MAIL;
I've reviewed the script many times and I find no error. But when I call it I always have this error:
ORA-20004: ORA-29278: SMTP transient error: 421 Service not available
I have done many tests. Although the most meaningful test that I have done may be the send of a message via telnet  from the same server using the same parameters. It has worked!. This is the log:
220 server.exchange.test.com ESMTP Service ready
AUTH LOGIN
334 VXNad23hsdj2bWU6
bm90aWZpY2FjaW9uZMSA12smVsQHNvcG9ydGUtc21zLmVz
334 UGFzer24cmQ6
TDRdE3p6NA==
235 LOGIN authentication successful
MAIL FROM:<[email protected]>
250 MAIL FROM:<[email protected]> OK
RCPT TO: <[email protected]>
250 RCPT TO:<[email protected]> OK
DATA
354 Start mail input; end with <CRLF>.<CRLF>
From:Yomismo
TO:Mimismo
Subject: Test Send Emails
This is a send test
250 <522DCAD000D5FF89> Mail accepted
QUIT
221 server.exchange.test.com QUIT
Connection to host lost.
This test email was received for me, so I think is evidenced that the problem is in ULT_SMTP package.
And more specifically, I suspect that the exception raises on one of these lines:
        UTL_SMTP.QUIT(MAIL_CONN);
        MAIL_CONN := UTL_SMTP.OPEN_CONNECTION(MAILHOST, 25);
But I don´t understand why, All the sites I have viewed uses package of similar way...
Can someone throw me some light on this issue?
Regards

Answer 1

maybe you find something in https://community.oracle.com/message/3560073. And I would recommend to think about upgrading to a current Oracle version, since 9.2 has been desupported around 2007.