Problem with Email Notification in Oracle 10g

Question

Hello Guys,
I have the following simple stored procedure for notifying emails.The procedure is getting executed successfully, but no email is being sent to mailbox, any help is appreciable.!! I'm very new to write this pl/sql stuff..!!! This is a very Urgent issue, need help ASAP.Thanks
Source Code:
CREATE OR REPLACE PROCEDURE Test_mail (sender IN VARCHAR2,
recipient IN VARCHAR2,
message IN VARCHAR2)
IS
mailhost VARCHAR2(30) := 'mail.sfsu.edu';
mail_conn utl_smtp.connection;
BEGIN
mail_conn := utl_smtp.open_connection(mailhost, 25);
utl_smtp.helo(mail_conn, mailhost);
utl_smtp.mail(mail_conn, sender);
utl_smtp.rcpt(mail_conn, recipient);
utl_smtp.data(mail_conn, message);
utl_smtp.quit(mail_conn);
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('error');
END Test_mail;

Answer 1

Thanks for ur help,
I got the below msg in command prompt when I fired telnet mailserver 25
..could not open connection to host, connection failed.
So how to sort out this problem?
How does mailserver 25 points to my smtp server (mail.sfsu.edu)?
is there any otherway to test? either yahoo or gmail?
Thanks, looking farward to ur reply, appreciate ur help.