postfix dovecot postfixadmin
 

I tried for 3 days and come up with this error and dont know what to do next ;( please help
p.s. I'm trying first time to setup mail server. tryed diferent manuals but no luck maybe you can help with problem
log files say
mail.log

Feb 28 03:34:18 ubuntu postfix/master[6306]: warning: process /usr/lib/postfix/virtual pid 7169 exit status 1
Feb 28 03:34:18 ubuntu postfix/master[6306]: warning: /usr/lib/postfix/virtual: bad command startup -- throttling

postconf -n

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
html_directory = /usr/share/doc/postfix/html
inet_interfaces = all
mailbox_size_limit = 0
message_size_limit = 30720000
mydestination = localhost, localhost.localdomain
myhostname = mail.domain.com
mynetworks = 192.168.0.0/16
myorigin = /etc/mailname
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relayhost =
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_domains =
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_gid_maps = 5000
virtual_mailbox_base = /home/vmail
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domain_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_uid_maps = 5000

Hi,
try replacing this:
With this:
'mailbox_size_limit' must be greater than 'message_size_limit'