Hi, I have compiled vpopmail and all works properly except the relay part. I have checked de /var/qmail/supervise/qmail-smtpd/run file and there is the tcpserver -x /paht/tcp.smtp.cdb. I have been checking the FAQS and the mailing lists, but there is no information regarding my problem, since the steps to set up the --enable-roaming-users=y are like those I have done.
Furthermore, I have modified the tcp.smtp.cdb manually and I have put there an IP address (xxx.yyy.xx.yyy). After reloading, qmail accepts to relay pop-clients from that IP. So I don't know where lies the problem. I think it might has to do with the fact that there is no writing in the /homevpopmail/etc/tcp.smtp with the ip of the pop-authenticathed client who wants to relay. Thanks in advance for you attention.