Sending email to multiple address using Utl_Smtp

Question

Hi,
I want to send email to multiple address using the Utl_Smtp feature.
When I am sending email to one email address in the To:Field it works fine.However, when I send
to multiple address I am getting the below error.I am using a table(Email_test) to store all email id.
Error report:
ORA-29279: SMTP permanent error: 501 5.1.3 Invalid address
ORA-06512: at "SYS.UTL_SMTP", line 20
ORA-06512: at "SYS.UTL_SMTP", line 98
ORA-06512: at "SYS.UTL_SMTP", line 240
ORA-06512: at line 48
29279. 00000 - "SMTP permanent error: %s"
*Cause:    A SMTP permanent error occurred.
*Action:   Correct the error and retry the SMTP operation.
I am trying two options both ways I am getting error
Option 1:
Selecting two email id indivually in the select query as below
select email into v_Recipient1 from Email_test where Key_name='U1';
select email into v_Recipient2 from Email_test where Key_name='U2';
v_Recipient := v_Recipient1||';'||v_Recipient2;
Option 2:
Is there a way to use option
select email into v_Recipient1 from Email_test where Key_name='U4';
===========================================================
Create table Script
===========================================================
create table Email_test (Email varchar2(100),Key_name varchar2(10));
insert into Email_test values ('[email protected]','U1');
insert into Email_test values ('[email protected]','U2');
insert into Email_test values ('[email protected]','U3')
insert into Email_test values ('[email protected];[email protected];[email protected]','U4');
select * from Email_test
[email protected]                         U1
[email protected]                         U2
[email protected]                         U3
[email protected];[email protected];[email protected]     U4
select * from Email_test where Key_name in ('U1','U2','U3')
[email protected]     U1
[email protected]     U2
[email protected]     U3
select * from Email_test where Key_name='U4'
[email protected];[email protected];[email protected]
=======================================================
PL/SQL Block
===========================================================
declare
v_From VARCHAR2(80) := '[email protected]';
v_cc VARCHAR2(80);
v_Recipient VARCHAR2(80) ;
v_Recipient1 VARCHAR2(80) ;
v_Recipient2 VARCHAR2(80) ;
v_Subject VARCHAR2(80);
v_Mail_Host VARCHAR2(50);
v_Mail_Conn utl_smtp.Connection;
crlf VARCHAR2(2) := chr(13)||chr(10);
begin
--Mail Host name
select VALUE into v_Mail_Host from Server_info where server_name = 'SMTPServer';
select email into v_Recipient1 from Email_test where Key_name='U1';
select email into v_Recipient2 from Email_test where Key_name='U2';
v_Recipient := v_Recipient1||';'||v_Recipient2;
--for CC
select email into v_cc from Email_test where Key_name='U3';
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.Rcpt(v_Mail_Conn, v_cc); -- To CC recepient
utl_smtp.Rcpt(v_Mail_Conn, v_BCC); To BCC recepient
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 ||
'Cc: ' || v_cc || crlf ||
'Content-Type: text/html;' ||crlf ||
--'Hello this is a test email');
crlf || to_char(sysdate, 'Dy, DD Mon YYYY hh24:mi:ss') || crlf );
utl_smtp.Quit(v_mail_conn);
end;
Any suggestion how to approach this issue.
Thank you

Answer 1

Simple Mail Transfer Protocol RFC 5321 specifications.
      RCPT TO:<forward-path> [ SP <rcpt-parameters> ] <CRLF>
   The first or only argument to this command includes a forward-path
   (normally a mailbox and domain, always surrounded by "&gt;" and "&lt;"
   brackets) identifying one recipient.In other words, you can only define a SINGLE mailbox address at a time. Multiple addresses requires multiple repeats of this command verb, once per maibox.
Do not confuse this and the To: tag line in the Mime header that contains a comma delimited list of recipients. That tag line can contain anything - it is not parsed, not checked, and not verified as matching the actual recipient mailboxes as specified via the RCPT TO verb.