postfix/qmgr[129005]: warning: connect to transport private/mydomain.tld: Connection refused

Hi All,
I've recently migrated this week my personal server with ISPConfig installed on it, and after changed the IP address and touching nothing else, now Postfix cannot send or receive any email (?!).
I've checked all the configurations and I can't figure out what's going on...
I've Googled about this error, and it seems to be something known since many years. I've also saw threads from HowToForge where ISPConfig's Staff help other users with this exact problem and they told them that it is on the clamav+amavis side, that must be running in order Postfix to work normally.
Problem is that these services --and also others expected to be up too-- are really running normally, so I don't know what is happening.
I paste you the contents of the "/etc/postfix/master.conf" and "/etc/postfix/main.cf" files if you kindly want to help me with this:

Code:

root@aio:~# cat /etc/postfix/master.cf
#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master" or
# on-line: http://www.postfix.org/master.5.html).
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ================================================================================
# service          type  private  unpriv  chroot  wakeup  maxproc  command + args
#                         (yes)   (yes)   (yes)   (never) (100)
# ================================================================================

#smtp              inet    n       -       -       -       1       postscreen

#smtpd             pass    -       -       -       -       -       smtpd

#dnsblog           unix    -       -       -       -       0       dnsblog

#tlsproxy          unix    -       -       -       -       0       tlsproxy

smtp               inet    n       -       y       -       -       smtpd
#   -o smtpd_reject_unlisted_recipient=no
#   -o smtpd_client_restrictions=$mua_client_restrictions
#   -o smtpd_helo_restrictions=$mua_helo_restrictions
#   -o smtpd_sender_restrictions=$mua_sender_restrictions
#   -o smtpd_recipient_restrictions=
#   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
#   -o milter_macro_daemon_name=ORIGINATING

submission         inet    n       -       y       -       -       smtpd
    -o syslog_name=postfix/submission
    -o smtpd_tls_security_level=encrypt
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#   -o smtpd_reject_unlisted_recipient=no
#   -o smtpd_client_restrictions=$mua_client_restrictions
#   -o smtpd_helo_restrictions=$mua_helo_restrictions
#   -o smtpd_sender_restrictions=$mua_sender_restrictions
#   -o smtpd_recipient_restrictions=
#   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
#   -o milter_macro_daemon_name=ORIGINATING

#628               inet    n       -       -       -       -       qmqpd

#submission        inet    n       -       y       -       -       smtpd

smtps              inet    n       -       y       -       -       smtpd
    -o syslog_name=postfix/smtps
    -o smtpd_tls_wrappermode=yes
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_client_restrictions=permit_sasl_authenticated,reject

pickup             unix    n       -       y       60      1       pickup

cleanup            unix    n       -       y       -       0       cleanup

qmgr               unix    n       -       n       300     1       qmgr

#qmgr              unix    n       -       n       300     1       oqmgr

tlsmgr             unix    -       -       y       1000?   1       tlsmgr

rewrite            unix    -       -       y       -       -       trivial-rewrite

bounce             unix    -       -       y       -       0       bounce

defer              unix    -       -       y       -       0       bounce

trace              unix    -       -       y       -       0       bounce

verify             unix    -       -       y       -       1       verify

flush              unix    n       -       y       1000?   0       flush

proxymap           unix    -       -       n       -       -       proxymap

proxywrite         unix    -       -       n       -       1       proxymap

smtp               unix    -       -       y       -       -       smtp
#   -o smtp_helo_timeout=5 -o smtp_connect_timeout=5

relay              unix    -       -       y       -       -       smtp

showq              unix    n       -       y       -       -       showq

error              unix    -       -       y       -       -       error

retry              unix    -       -       y       -       -       error

discard            unix    -       -       y       -       -       discard

local              unix    -       n       n       -       -       local

virtual            unix    -       n       n       -       -       virtual

lmtp               unix    -       -       y       -       -       lmtp

anvil              unix    -       -       y       -       1       anvil

#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#

scache             unix    -       -       y       -       1       scache

maildrop           unix    -       n       n       -       -       pipe
    flags=DRhu user=vmail argv=/usr/bin/maildrop -d vmail ${extension} ${recipient} ${user} ${nexthop} ${sender}

#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus             unix    -       n       n       -       -       pipe
#   user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}

#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus         unix    -       n       n       -       -       pipe
#   flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}

#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp               unix    -       n       n       -       -       pipe
    flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)

#
# Other external delivery methods.
#
ifmail             unix    -       n       n       -       -       pipe
    flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)

bsmtp              unix    -       n       n       -       -       pipe
    flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient

scalemail-backend  unix    -       n       n       -       2       pipe
    flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}

mailman            unix    -       n       n       -       -       pipe
    flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}

dovecot            unix    -       n       n       -       -       pipe
    flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}@${nexthop}


amavis unix - - - - 2 smtp
        -o smtp_data_done_timeout=1200
        -o smtp_send_xforward_command=yes
        -o smtp_bind_address=


127.0.0.1:10025 inet n - n - - smtpd
        -o content_filter=
        -o local_recipient_maps=
        -o relay_recipient_maps=
        -o smtpd_restriction_classes=
        -o smtpd_client_restrictions=
        -o smtpd_helo_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o smtpd_end_of_data_restrictions=
        -o mynetworks=127.0.0.0/8
        -o strict_rfc821_envelopes=yes
        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
        -o smtp_send_xforward_command=yes
        -o disable_dns_lookups=yes
        -o address_verify_virtual_transport=$virtual_transport
        -o address_verify_transport_maps=$transport_maps


127.0.0.1:10027 inet n - n - - smtpd
        -o content_filter=
        -o local_recipient_maps=
        -o relay_recipient_maps=
        -o smtpd_restriction_classes=
        -o smtpd_client_restrictions=
        -o smtpd_helo_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o smtpd_end_of_data_restrictions=
        -o mynetworks=127.0.0.0/8
        -o strict_rfc821_envelopes=yes
        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
        -o smtp_send_xforward_command=yes
        -o disable_dns_lookups=yes
        -o address_verify_virtual_transport=$virtual_transport
        -o address_verify_transport_maps=$transport_maps
        -o milter_default_action=accept
        -o milter_macro_daemon_name=ORIGINATING

root@aio:~#

Code:

root@aio:~# cat /root/main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname
myorigin = mail.mydomain.tld

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)

biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
delay_warning_time = 4h

readme_directory = /usr/share/doc/postfix

# TLS parameters
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination

myhostname = mail.mydomain.tld

alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases

alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases

mydestination = mail.mydomain.tld, localhost, localhost.localdomain

#relayhost =

mynetworks =
    127.0.0.0/8,
    [::ffff:127.0.0.0]/104,
    [::1]/128,
    10.0.0.0/8,
    212.xxx.xxx.xxx/27,
    [2a03:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]/56

mailbox_command = procmail -a "$EXTENSION"

mailbox_size_limit = 0

recipient_delimiter = +

inet_interfaces = all

html_directory = /usr/share/doc/postfix/html

virtual_alias_domains = proxy:mysql:/etc/postfix/mysql-virtual_alias_domains.cf

virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_alias_maps.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf

virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf

virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf

virtual_mailbox_base = /var/vmail

virtual_uid_maps = proxy:mysql:/etc/postfix/mysql-virtual_uids.cf

virtual_gid_maps = proxy:mysql:/etc/postfix/mysql-virtual_gids.cf

inet_protocols = all

smtpd_sasl_auth_enable = yes

broken_sasl_auth_clients = yes

smtpd_sasl_authenticated_header = yes

smtpd_helo_restrictions = permit_mynetworks, reject_unknown_recipient_domain, check_helo_access regexp:/etc/postfix/helo_access, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_non_fqdn_hostname, reject_invalid_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unauth_destination, reject_unauth_pipelining, reject_rbl_client sbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client b.barracudacentral.org, reject_rbl_client xbl.spamhaus.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.score.senderscore.com, check_helo_access regexp:/etc/postfix/blacklist_helo, reject_unknown_helo_hostname, permit

smtpd_recipient_restrictions = permit_mynetworks, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unlisted_recipient, check_recipient_access proxy:mysql:/etc/postfix/mysql-verify_recipients.cf, permit_sasl_authenticated, reject_invalid_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_non_fqdn_hostname, reject_unauth_destination, reject_unauth_pipelining, reject_rbl_client sbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client b.barracudacentral.org, reject_rbl_client xbl.spamhaus.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.score.senderscore.com, check_recipient_access proxy:mysql:/etc/postfix/mysql-virtual_recipient.cf, check_recipient_access mysql:/etc/postfix/mysql-virtual_policy_greylist.cf, check_policy_service unix:private/quota-status, check_client_access hash:/etc/postfix/rbl_override

smtpd_tls_security_level = may

transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf

relay_domains = proxy:mysql:/etc/postfix/mysql-virtual_relaydomains.cf

relay_recipient_maps = proxy:mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf

sender_dependent_default_transport_maps = regexp:/etc/postfix/sdd_transport_maps.regexp

proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $smtpd_sender_login_maps $virtual_uid_maps $virtual_gid_maps $smtpd_client_restrictions $smtpd_sender_restrictions $smtpd_recipient_restrictions $smtp_sasl_password_maps $sender_dependent_relayhost_maps

smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch, check_sender_access regexp:/etc/postfix/tag_as_originating.re, permit_mynetworks, check_sender_access proxy:mysql:/etc/postfix/mysql-virtual_sender.cf, reject_sender_login_mismatch, permit_sasl_authenticated, reject_non_fqdn_sender, reject_unlisted_sender, check_sender_access regexp:/etc/postfix/tag_as_foreign.re

smtpd_client_restrictions = check_client_access proxy:mysql:/etc/postfix/mysql-virtual_client.cf, permit_inet_interfaces, permit_mynetworks, permit_sasl_authenticated, reject_rbl_client sbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client b.barracudacentral.org, reject_rbl_client xbl.spamhaus.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.score.senderscore.com, reject_unauth_pipelining, reject_unknown_client_hostname, permit

smtpd_client_message_rate_limit = 100

maildrop_destination_concurrency_limit = 1

maildrop_destination_recipient_limit = 1

virtual_transport = lmtp:unix:private/dovecot-lmtp

header_checks = regexp:/etc/postfix/header_checks

mime_header_checks = regexp:/etc/postfix/mime_header_checks

nested_header_checks = regexp:/etc/postfix/nested_header_checks

body_checks = regexp:/etc/postfix/body_checks

owner_request_special = no

smtp_tls_security_level = dane

smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3

smtpd_tls_protocols = !SSLv2,!SSLv3

smtp_tls_protocols = !SSLv2,!SSLv3

dovecot_destination_recipient_limit = 1

smtpd_sasl_type = dovecot

smtpd_sasl_path = private/auth

content_filter = lmtp:[127.0.0.1]:10024

receive_override_options = no_address_mappings

message_size_limit = 0

sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf

smtpd_restriction_classes = greylisting

greylisting = check_policy_service inet:127.0.0.1:10023

smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf

smtpd_helo_required = yes

smtpd_tls_exclude_ciphers = RC4, aNULL

smtp_tls_exclude_ciphers = RC4, aNULL

smtpd_etrn_restrictions = permit_mynetworks, reject

smtpd_data_restrictions = permit_mynetworks, reject_unauth_pipelining, reject_multi_recipient_bounce, permit

smtpd_tls_mandatory_ciphers = medium

tls_medium_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA

tls_preempt_cipherlist = yes

address_verify_negative_refresh_time = 60s

enable_original_recipient = yes

smtpd_forbidden_commands = CONNECT,GET,POST,USER,PASS

address_verify_sender_ttl = 15686s

smtp_dns_support_level = dnssec

#smtp_use_tls = yes
#smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_sasl_auth_enable = yes
#relayhost = w.x.y.z:26
smtp_sasl_password_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender-relayauth.cf, texthash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous, noplaintext
smtpd_reject_unlisted_sender = no
sender_dependent_relayhost_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender-relayhost.cf
smtp_sender_dependent_authentication = yes
smtp_sasl_tls_security_options = noanonymous
authorized_flush_users =
authorized_mailq_users = nagios, icinga
address_verify_virtual_transport = smtp:[127.0.0.1]:10025
address_verify_transport_maps = static:smtp:[127.0.0.1]:10025

root@aio:~#

Thank you so much in advance!
Olivier