problem with this message lmtpd signaled to death by 11

[Eric Doutreleau]

hi

i m using cyrus2.3.6 on a RHEL4 server
the mail is delivered from a postfix server via lmtp

from time to time i got that kind of message on the postfix side

Nov  3 08:32:12 sodome postfix/lmtp[30982]: 021B618D6F6: 
to=<forum_eq at mci-lmtp.i
nt-evry.fr>, orig_to=<forum_equipe at int-evry.fr>, 
relay=molure.int-evry.fr[157.15
9.10.18], delay=418045, status=deferred (lost connection with 
molure.int-evry.fr
[157.159.10.18] while sending end of data -- message may be sent more 
than once)

on the cyrus side i got this message

Nov  3 08:32:00 pasargades lmtp[27525]: dupelim: eliminated duplicate 
message to
 forum_eq id <454A011F.8050705 at int-evry.fr> (redirect)
Nov  3 08:32:00 pasargades last message repeated 97 times
Nov  3 08:32:01 pasargades master[22291]: process 27525 exited, signaled 
to deat
h by 11

the forum_eq user has a huge sieve filter that redirects the mail to 111 
persons

and the effect of all that is that some of this users received several 
times the same mail.

Does someone know how to solve this problem?

thanks in advance for any help