[Mailman-Developers] post got bad listname

Hello...

I recently installed the new Mailman 2.1.1, i follow all the steps that the install file said me to did, i created a list, but when i send a test mail to the list return me this

This is the Postfix program at host chuao.fundacite.arg.gov.ve.

I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can delete your own text from the message returned below.

          The Postfix program

<prueba2@fundacite.arg.gov.ve>: Command died with status 1: "/usr/local/mailman/mail/mailman post prueba2". Command output: Mailman error: post got bad listname: prueba2

Final-Recipient: rfc822; prueba2@fundacite.arg.gov.ve Action: failed Status: 5.0.0 Diagnostic-Code: X-Postfix; Command died with status 1: "/usr/local/mailman/mail/mailman post prueba2". Command output: Mailman error: post got bad listname: prueba2

Please Help.....

Thanks...... Eduardo Manrique Network adm...