blocked by my ISP's smtp server

[marc guillaume]

Thanks for your responses. 

I needed to forward to wanadoo the requests for domain wanadoo.fr, the
solution was : 

zone "wanadoo.fr" {
        type forward;
        forward only;
        forwarders { 80.10.246.2; 80.10.246.129; };
};
in my /etc/named.conf

I readed here that forwarders where a "bad" solution but in this case it
works. If anybody knows a better way...