[Exim] Retry rule?

With the following retry rules (exim 4.10), why do I still get mail
lying for longer than 3 days on my queue?

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# Local machines are retried more regularly (i.e. 1 min).

*.sun.ac.za         *              F,12h,1m; G,24h,10m,1.5; F,3d,30h

# Everybody else starts with a 12 min retry interval.
*                   *              F,2h,12m; G,16h,2h,1.5; F,2d,4h
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Regards.
Johann
--
Johann Spies          Telefoon: 021-808 4036
Informasietegnologie, Universiteit van Stellenbosch

     "But as many as received him, to them gave he power to
      become the sons of God, even to them that believe on
      his name."    John 1:12