Check
/etc/postfix/mysql-virtual_domains.cf to see if your mysql connection settings are correct.
Try
ps ax | grep postfix to see if postfix is running.
From what I see, it seems to crash because it can't connect to mysql to get the users table. I'm not sure if it's supposed to crash in this case, though...
My config file looks like this (yours could be a little different):
Code:
user = xxx
password = xxx
dbname = users_database
table = domains
select_field = 'virtual'
where_field = domainname
hosts = 127.0.0.1