DECLARE
v_From      VARCHAR2(80) := 'oracle@mycompany.com';
v_Recipient VARCHAR2(80) := 'test@mycompany.com';
v_Subject   VARCHAR2(80) := 'test subject';
v_Mail_Host VARCHAR2(30) := 'mail.mycompany.com';
v_Mail_Conn utl_smtp.Connection;
crlf        VARCHAR2(2)  := chr(13)||chr(10);
BEGIN
v_Mail_Conn := utl_smtp.Open_Connection(v_Mail_Host, 25);
utl_smtp.Helo(v_Mail_Conn, v_Mail_Host);
utl_smtp.Mail(v_Mail_Conn, v_From);
utl_smtp.Rcpt(v_Mail_Conn, v_Recipient);
utl_smtp.Data(v_Mail_Conn,
'Date: '   || to_char(sysdate, 'Dy, DD Mon YYYY hh24:mi:ss') || crlf ||
'From: '   || v_From || crlf ||
'Subject: '|| v_Subject || crlf ||
'To: '     || v_Recipient || crlf ||
crlf ||
'some message text'|| crlf ||   -- Message body
'more message text'|| crlf
 );
utl_smtp.Quit(v_mail_conn);
EXCEPTION
WHEN utl_smtp.Transient_Error OR utl_smtp.Permanent_Error then
raise_application_error(-20000, 'Unable to send mail', TRUE);
END;