More problems, I'm too idiot, I'm sorry. 1º) To send mail via Thunderbird in a external network, I have to configure the postfix main.cf file...so in the line mynetworks I have added 0.0.0.0/0 Is it correct? 2º) I'm trying to configure the Thunderbird client to access via pop to my server, pop.myserver.com from a external network... but Thunderbird allways said me "There are no messages on the server" but if I connect via webmail, with squirrelmail I can see new messages also if I work in my local network with thunderbird I can download the new messages. There are no error in log file... I'm confused. Can anybody help me again?... thanks.