[CentOS] I don't see my messages

Jordi Espasa Clofent wrote
> I can send any messages in the list, but the curious problem is I don't
> see my own messages
>
> ¿?¿?
>
> I can see my sended messages in CentOS mail archive but not in my email
> client (ThunderBird).
>   

mailman has an option to not send duplicate messages to the author.