[Exim] Error 451

Hi,

I have a trouble with the smtp server of one of our contact.

when I issue exim -d9 -M <Mid>

i got:

Connecting to mail.xxx.asso.fr [xxx.xxx.xxx.xxx.25] ... connected
read response data: size=24
SMTP<< 220 SMTP service ready
SMTP>> EHLO <my host name>

read response data: size=85
  SMTP<< 250-Requested mail action okay, completed
         250-8BITMIME
         250-SIZE 5000000
         250 HELP

SMTP>> MAIL FROM:<the name@???> SIZE=2143
read response data: size=57
SMTP<< 451 Requested action aborted: local error in processing
ok=0 send_quit=1 send_rset=1 continue_more=0 yield=0 first_address=135747296
SMTP>> QUIT

My exim version is :

Exim version 3.33 debug level 9 uid=0 gid=0
Berkeley DB: Sleepycat Software: Berkeley DB 3.1.17: (July 31, 2000)

Can someone tell me what could be the problem ?

I tried to telnet this server, i got an answer 451 with some email adresses,
and 250 if i give an other adress (both of them are correct adresses)

just before sending this mail, i tried with an silly adress, wich give me a
250 answer !


Thank you in advance for any advice

Pascal