[exim] Exim + mailman + SA : Mail are checked twice

Hi,

I use mailman 2.1 with exim4 and spamassassin as ACL check.

So, all mail sended to a list localy provided by mailman are spam
scaneed twice. First when mail is received and another time when
mailman the mail to send to recipients.

I use a mailman config like documeted on exim.org docs.

How could I avoid that ?

Thanks

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