[exim] accepting from no host name

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Lähettäjä: Jamie Nudds
Päiväys:  
Vastaanottaja: exim-users
Aihe: [exim] accepting from no host name
Hi

Could someone point point me in the right direction of how I can
accept mail from one IP address that does not have a host name?

error

no host name found for IP address xxx.xxx.xxx.xxx

Thanks