Получатель PostFix 550 5.1.1, не найденный из внешней электронной почты

Это - новая установка. PostFix сообщает "550 5.1.1" "Получателя, не найденные". когда пользователи существуют.

• Пользователь может послать электронное письмо везде.
• Пользователи могут послать электронное письмо друг другу через localhost.
• Все внешние электронные письма пользователям возвращаются 550 5.1.1 сообщения об ошибке.

Я не вижу ошибок в maillog файле. Я думаю, что считал каждый поток на этом сайте с "550" в нем, но не ответов казался соответствующим. Кто-либо знает, почему об известных пользователях сообщают как не найденный?

Вот мои файлы конфигурации:

/etc/postfix/master.cf

# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       -       smtpd
submission inet n       -       n       -       -       smtpd
#  -o smtpd_tls_security_level=encrypt
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
smtps     inet  n       -       n       -       -       smtpd
#  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628      inet  n       -       n       -       -       qmqpd
pickup    fifo  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
#qmgr     fifo  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay     unix  -       -       n       -       -       smtp
    -o smtp_fallback_relay=
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache

/etc/postfix/main.cf

#soft_bounce = no

queue_directory = /var/spool/postfix

command_directory = /usr/sbin

daemon_directory = /usr/libexec/postfix

data_directory = /var/lib/postfix

mail_owner = postfix

#default_privs = nobody

# INTERNET HOST AND DOMAIN NAMES
#myhostname = host.domain.tld
#myhostname = virtual.domain.tld
mydomain = [MYACTUALDOMAINNAME].com      
#myorigin = $myhostname
myorigin = $mydomain

inet_interfaces = all
#inet_interfaces = $myhostname
#inet_interfaces = $myhostname, localhost
#inet_interfaces = localhost

# Enable IPv4, and IPv6 if supported
inet_protocols = all

#proxy_interfaces =
#proxy_interfaces = 1.2.3.4

# See also below, section "REJECTING MAIL FOR UNKNOWN LOCAL USERS".
#
mydestination = localhost, localhost.$mydomain

unknown_local_recipient_reject_code = 550

# Specify "mynetworks_style = host" when Postfix should "trust"
# only the local machine.
# 
#mynetworks_style = class
#mynetworks_style = subnet
#mynetworks_style = host

# INTERNET OR INTRANET

#relayhost = $mydomain
#relayhost = [gateway.my.domain]
#relayhost = [mailserver.isp.tld]
#relayhost = uucphost
#relayhost = [an.ip.add.ress]

# REJECTING UNKNOWN RELAY USERS
#relay_recipient_maps = hash:/etc/postfix/relay_recipients

# INPUT RATE CONTROL 
# Specify 0 to disable the feature. Valid delays are 0..10.
# 
#in_flow_delay = 1s

#alias_maps = dbm:/etc/aliases
alias_maps = hash:/etc/aliases
#alias_maps = hash:/etc/aliases, nis:mail.aliases
#alias_maps = netinfo:/aliases


# DELIVERY TO MAILBOX
home_mailbox = Maildir/

# The mail_spool_directory parameter specifies the directory where
# UNIX-style mailboxes are kept. The default setting depends on the
# system type.
#
#mail_spool_directory = /var/mail
#mail_spool_directory = /var/spool/mail

#mailbox_command = /some/where/procmail
#mailbox_command = /some/where/procmail -a "$EXTENSION"

#mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp

#mailbox_transport = cyrus


#luser_relay = $user@other.host
#luser_relay = $local@other.host
#luser_relay = admin+$local

#header_checks = regexp:/etc/postfix/header_checks

# FAST ETRN SERVICE
#fast_flush_domains = $relay_domains

# SHOW SOFTWARE VERSION OR NOT
#smtpd_banner = $myhostname ESMTP $mail_name
#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

# PARALLEL DELIVERY TO THE SAME DESTINATION
#local_destination_concurrency_limit = 2
#default_destination_concurrency_limit = 20

# INSTALL-TIME CONFIGURATION INFORMATION
sendmail_path = /usr/sbin/sendmail.postfix

newaliases_path = /usr/bin/newaliases.postfix

mailq_path = /usr/bin/mailq.postfix

setgid_group = postdrop

# html_directory: The location of the Postfix HTML documentation.
#
html_directory = no

# manpage_directory: The location of the Postfix on-line manual pages.
#
manpage_directory = /usr/share/man

Вот сообщение об ошибке от Gmail

Delivery to the following recipient failed permanently:

     [user@email.com]

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain [domain.com] by smtp.secureserver.net. [68.178.213.37].

The error that the other server returned was:
550 5.1.1 <[user@email.com]> Recipient not found.  <http://x.co/irbounce>