[exim] mail loop

I configure exim 4.42 , with the exiscan-acl and sa-exim, but when i try to recive a message in the mainlog i dont see any problem but in the sender side i have this error:

Too many "Received" headers - suspected mail loop

------ This is a copy of the message, including all the headers. ------

Return-path: <paul.vanegas@???>
Received: from xxxxx 
       by xxx with esmtp (Exim 4.42)
       id 1CsVWh-0000Lc-Ha
       for xxxxxx; Sat, 22 Jan 2005 19:22:47 -0500
Received: from xxxxxx
       by xxxxxxxxxx with esmtp (Exim 4.42)
       id 1CsVWD-0000L4-Fx
       for xxxxxx; Sat, 22 Jan 2005 19:22:17 -0500
Received: from xxxxxxx helo=xxxxxx)
       by xxxxxxx with esmtp (Exim 4.42)
       id 1CsVVj-0000KX-F3
       for xxxxxxxxxxx; Sat, 22 Jan 2005 19:21:47 -0500
Received: from xxxxxxxxx       by xxxxxxxx with esmtp (Exim 4.42)
       id 1CsVVF-0000Jo-Dj
       for xxxxxx; Sat, 22 Jan 2005 19:21:17 -0500

What can be the problem ??

thanks

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