Stefano - 2011-09-29

Hi everybody,
I've installed webmin and then virtualmin on a CentOS Linux 5.7. After some troubles and documentation reading I've been able to run everything I needed (virtual domains, Apache, PHP, MySQL, DNS and so on) except the e-mail. When validating the virtual servers I get this error: "Mail for domain : The mail server is not configured to receive email for xxxx". I've already tried to re-install postfix and to fallows various howto for configuration, but it still doesn't work. Can anybody please give me some hints?
Thanks in advance,