[exim] problem with mail getting rejected

Hi all

I have here a small but irritating problem.

We carry a huge number of emails through or exim server (about 500
user's worth).

The problem is our ISP rejects our mails at 200 recipients/hour with a
554 error message, and that the exim then sends an mailer-deamon to
the sender.

Is there a way I can tell exim not to drop the mail, but keep resending it?

Regards
Ian