[Exim] backup mx

Hi all
I am trying to setup a backup mx for my domain, I am using Exim 3.35 on debian
woody (stable)
I put my domain in relay_domains
relay_domains = mostert.nom.za

Yet I keep getting the message:
2004-04-23 14:54:47 refused relay (host) to <linux@???> from
<kxgx956b@???> H=host-81-190-62-174.lublin.mm.pl [81.190.62.174]

I can't figure this out

Mozzi


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