Hello Falko, you are my hero!
I started amavisd and its working now!
Thank you very much.
I can access my accounts from squirrelmail and read the test mail sent via mailx, but when I try to send mail from the client squirrelmail "Compose" option, I got this error:
ERROR: Connection dropped by IMAP server.
Do you have any idea about this error? I can read correctly but I cant send it.