[Mailman-Users] Errors while sending mail: centos + mailman + postfix

[Dr. Alberto Barengols]

Hello everybody!
   I just installed Mailman version: 2.1.15  in a Centos server running 
Postfix 2,11,3

  I had create a list ( cod3 at listas.pccorreo.com.ar ), and everything 
went right.

But when I send a message to this list it appears some errors:

==========================================================================
<cod3 at listas.pccorreo.com.ar>: Command died with status 5:
     "/usr/lib/mailman/mail/mailman". Command output: Usage:
     /usr/lib/mailman/mail/mailman program [args...]

<post at listas.pccorreo.com.ar> (expanded from 
<cod3 at listas.pccorreo.com.ar>):
     unknown user: "post"

<cod3 at listas.pccorreo.com.ar>: unknown user: "cod3"
==========================================================================

What do you think about??

Thanks in advance, Alberto
/////////////////////////////

-------- Mensaje Original --------


Transient hostname: listas.pccp.com.ar
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-327.4.4.el7.centos.plus.x86_64
Architecture: x86-64

Using Mailman version: 2.1.15
POSTFIX mail_version = 2.11.3