When I config nginx like this, it reports: "starting nginx...2010/10/12 11:44:04 [emerg] 14955#0: duplicate "143" address
and port pair in /opt/nginx/nginx.conf.mail.imap:19"
Is there something I did wrong or nginx doesn't support this?

# IMAP proxy configuration
#
server
{
server_name test.com;
listen 143;
protocol imap;
proxy on;
sasl_service_name "imap";
starttls only;
ssl_certificate /opt/certs/test.com.crt;
ssl_certificate_key /opt/certs/test.com.key;
}


server
{
server_name foo.com;
listen 143;
protocol imap;
proxy on;
sasl_service_name "imap";
starttls only;
ssl_certificate /opt/certs/foo.com.crt;
ssl_certificate_key /opt/certs/foo.com.key;
}

server
{
#server_name default;
listen 143;
protocol imap;
proxy on;
sasl_service_name "imap";
starttls only;
ssl_certificate /opt/certs/nginx.crt;
ssl_certificate_key /opt/certs/nginx.key;
}