Outlook 2003 (on Windows XP), try sending email in MSIE immediately

[Kenon]

I am trying to sent emails originated in MSIE immediately
through Outlook 2003. Unfortunately, Outlook won't send
these emails immediately when they get into the Outbox.
They hang there for a period of time and then are sent
out. I can go and click the "Send/Receive" button to
send the emails, but I don't want to have to do that. Is
there anyway to change this so that emails originated
with MSIE will send immediately and automatically through
Outlook? Thanks.

Kenon