[exim] Recipient address rejected: GREYLISTED by postgrey

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Autor: Alex
Data:  
A: exim users
Assumpte: [exim] Recipient address rejected: GREYLISTED by postgrey
I send a message to and external account and i have a returned email with
this

Recipient address rejected: GREYLISTED per postgrey de

Why my exim server not try to send the email more later ?