451 4.3.5 Server Configuration Error - Can no longer receive outside emails

[djtech]

Running on Ubuntu 9.10. I am suddenly unable to receive emails from outside (testing with a gmail account). I do not know what went wrong. A DNS test from checkdns.net returned the following:

<<< 220 mymailserver.mydomain.com ESMTP ispCP 1.0.4 OMEGA Managed
>>> HELO http://www.checkdns.net
<<< 250 mymailserver.mydomain.com
>>> MAIL FROM: <dnscheck@uniplace.com>
<<< 250 2.1.0 Ok
>>> RCPT TO: <postmaster@mydomain.com>
<<< 451 4.3.5 Server configuration problem
>>> RCPT TO: <root@mydomain.com>
<<< 550 5.1.1 <root@mydomain.com>: Recipient address rejected: User unknown in virtual mailbox table
>>> RCPT TO: <info@mydomain.com>
<<< 550 5.1.1 <info@mydomain.com>: Recipient address rejected: User unknown in virtual mailbox table
>>> RCPT TO: <webmaster@mydomain.com>
<<< 451 4.3.5 Server configuration problem

My main.cf looks like this:

# Postfix directory settings; These are critical for normal Postfix MTA functionallity
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix

# Some common configuration parameters
inet_interfaces = all
mynetworks_style = host

myhostname = mymailserver.mydomain.com
mydomain = mymailserver.mydomain.com.local
myorigin = $myhostname

smtpd_banner = $myhostname ESMTP ispCP 1.0.4 OMEGA Managed
setgid_group = postdrop

# Receiving messages parameters
mydestination = $myhostname, $mydomain
append_dot_mydomain = no
append_at_myorigin = yes
local_transport = local
virtual_transport = virtual
transport_maps = hash:/etc/postfix/ispcp/transport
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases

# Delivering local messages parameters
mail_spool_directory = /var/mail

# Mailboxquota
# => 0 for unlimited
# => 104857600 for 100 MB
mailbox_size_limit = 0
mailbox_command = procmail -a "$EXTENSION"

# Message size limit
# => 0 for unlimited
# => 104857600 for 100 MB
message_size_limit = 0

biff = no
recipient_delimiter = +

local_destination_recipient_limit = 1
local_recipient_maps = unix:passwd.byname $alias_database

# ispCP Autoresponder parameters
ispcp-arpl_destination_recipient_limit = 1

# Delivering virtual messages parameters
virtual_mailbox_base = /var/mail/virtual
virtual_mailbox_limit = 0

virtual_mailbox_domains = hash:/etc/postfix/ispcp/domains
virtual_mailbox_maps = hash:/etc/postfix/ispcp/mailboxes

virtual_alias_maps = hash:/etc/postfix/ispcp/aliases

virtual_minimum_uid = 1001
virtual_uid_maps = static:1001
virtual_gid_maps = static:8

# SASL paramters
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =
broken_sasl_auth_clients = yes

smtpd_helo_required = yes

smtpd_helo_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname

smtpd_sender_restrictions = reject_non_fqdn_sender,
reject_unknown_sender_domain,
permit_mynetworks,
permit_sasl_authenticated

smtpd_recipient_restrictions = reject_non_fqdn_recipient,
reject_unknown_recipient_domain,
permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
reject_unlisted_recipient,
check_policy_service inet:127.0.0.1:12525,
check_policy_service inet:127.0.0.1:60000,
permit

smtpd_data_restrictions = reject_multi_recipient_bounce,
reject_unauth_pipelining

# TLS parameters; activate, if avaible/used
#smtpd_use_tls = yes
#smtpd_tls_loglevel = 2
#smtpd_tls_cert_file = /etc/postfix/cert.pem
#smtpd_tls_key_file = /etc/postfix/privkey.pem
#smtpd_tls_auth_only = no
#smtpd_tls_received_header = yes

# AMaViS parameters; activate, if available/used
#content_filter = amavis:[127.0.0.1]:10024

# Quota support; activate, if available/used
#virtual_create_maildirsize = yes
#virtual_mailbox_extended = yes
#virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
#virtual_mailbox_limit_override = yes
#virtual_maildir_limit_message = "The user you're trying to reach is over mailbox quota."
#virtual_overquota_bounce = yes

The end of my /var/log/mail.log file reads:


Mar 25 00:06:09 mymailserver postfix/smtpd[20626]: NOQUEUE: reject: RCPT from mail-bw0-f219.google.com[209.85.218.219]: 451 4.3.5 Server configuration problem; from=<mygmailuser@gmail.com> to=<mygmailuser@mydomain.com> proto=ESMTP helo=<mail-bw0-f219.google.com>
Mar 25 00:06:09 mymailserver postfix/smtpd[20626]: disconnect from mail-bw0-f219.google.com[209.85.218.219]
Mar 25 00:08:20 mymailserver postfix/smtpd[20632]: connect from mail-bw0-f219.google.com[209.85.218.219]
Mar 25 00:08:21 mymailserver postfix/policyd-weight[2387]: decided action=PREPEND X-policyd-weight: using cached result; rate: -8.4; <client=209.85.218.219> <helo=mail-bw0-f219.google.com> <from=mygmailuser@gmail.com> <to=mygmailuser@mydomain.com>; delay: 1s
Mar 25 00:08:21 mymailserver postfix/smtpd[20632]: warning: connect to 127.0.0.1:60000: Connection refused
Mar 25 00:08:21 mymailserver postfix/smtpd[20632]: warning: problem talking to server 127.0.0.1:60000: Connection refused
Mar 25 00:08:22 mymailserver postfix/smtpd[20632]: warning: connect to 127.0.0.1:60000: Connection refused
Mar 25 00:08:22 mymailserver postfix/smtpd[20632]: warning: problem talking to server 127.0.0.1:60000: Connection refused
Mar 25 00:08:22 mymailserver postfix/smtpd[20632]: NOQUEUE: reject: RCPT from mail-bw0-f219.google.com[209.85.218.219]: 451 4.3.5 Server configuration problem; from=<mygmailuseronline@gmail.com> to=<mygmailuser@mydomain.com> proto=ESMTP helo=<mail-bw0-f219.google.com>
Mar 25 00:08:22 mymailserver postfix/smtpd[20632]: disconnect from mail-bw0-f219.google.com[209.85.218.219]


Please help. Thank you!