Htmldb_mail.send problem

Question

For some reason some of our customers have been receiving multiple copies of a same message. We are sending notifications to our clients and sometimes we can send out 4000 emails at a time.
Here is a trimed down example of the code that will allow to reproduce.
declare   
    I INTEGER := 1;
begin
  --Sending message to customer
  WHILE I < 1500 LOOP
    htmldb_mail.send(
      p_to   => 'email_from', -- Change this to something valid
      p_from => 'email_to',    --  Used my inbox to tes
      p_body => 'TEST' || I,
      p_subj => 'TEST' || I );
    I := I + 1;
  END LOOP;
end;What I get in my inbox when testing is 3000 + messages. Is there a limit on how many emails can be managed at a time in the queue?
I do not push the queue, I let it manage itself. We are using HTMLDB 2.0 and yes I know we should upgrade but it's not going to happen anytime soon.
P.S. When doing the same exercise with under 1000 loops, it works properly.
Thanks in advance for any help.

Answer 1

I did some more testing and it would seem that it's the HTMLDB_MAIL.PUSH_QUEUE that is to blame. I do not push the queue but we have other applications that call it.
If I have messages in the queue that are waiting and two other applications call the push queue I will receive multiple copies of the messages that are waiting to be sent.