[exim] temporarily rejected RCPT from my ISP relay MTAs

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Autor: R.B. (Rick)
Data:  
A: exim-users
Assumpte: [exim] temporarily rejected RCPT from my ISP relay MTAs
Hi all,
i've a problem with ISP MTAs... i have thousand of these logs line per
minute:

2004-12-30 14:25:20 H=(big-1c.inet.it) [213.92.5.8]
F=<qjgehyk@???> temporarily rejected RCPT
<hatbox@???>: Could not complete sender verify
2004-12-30 14:25:20 H=(fe-3a.inet.it) [213.92.5.105]
F=<czamjneafa@???> temporarily rejected RCPT
<etnean@???>: Could not complete sender verify
2004-12-30 14:25:20 H=(big-1c.inet.it) [213.92.5.8]
F=<qjgehyk@???> temporarily rejected RCPT
<armys@???>: Could not complete sender verify
2004-12-30 14:25:20 H=(fe-3a.inet.it) [213.92.5.105]
F=<czamjneafa@???> temporarily rejected RCPT
<bair@???>: Could not complete sender verify
2004-12-30 14:25:20 H=(fe-3a.inet.it) [213.92.5.105]
F=<czamjneafa@???> temporarily rejected RCPT
<adlewis@???>: Could not complete sender verify
2004-12-30 14:25:20 H=(fe-3a.inet.it) [213.92.5.105]
F=<czamjneafa@???> temporarily rejected RCPT
<araiva@???>: Could not complete sender verify

This, i think, is due to spammers that send directly to secondary MXs...
how can i avoid to respond temporarily reject on DNS problems and return
instead a permanent error?

Thanks

Riccardo