X-Postfix; Mailboxes not found when mail comes from others servers

configurationemail-serverpostfix

I had installed and configured dovecot, postfix, and postfixadmin step by step from this tutorial on my server (CentOS6).

I can create virtual mailboxes as well now and can login to roundcubemail, I can also send emails but when I want to send email from other mail systems like gmail, yahoo and etc then I get this error:

This is the mail system at host domain.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<admin@domain.com>: unknown user: "admin"

Final-Recipient: rfc822; admin@domain.com
Original-Recipient: rfc822;admin@domain.com
Action: failed
Status: 5.1.1
Diagnostic-Code: X-Postfix; unknown user: "admin"

This is postfix main.cf:

# network settings
inet_interfaces = all
mydomain = domain.com
myhostname = mail.domain.com
mynetworks = $config_directory/mynetworks
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
relay_domains = proxy:mysql:/etc/postfix/mysql-relay_domains_maps.cf

And the mynetworks file:

192.168.0.0/16
10.0.0.0/8
127.0.0.0/8
[::ffff:127.0.0.0]/104
[::1]/128
127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
130.185.0.0/16 # -> my domain ip

And mysql-relay_domains_maps.cf:

hosts = localhost
user = postfix
password = postfixpassword
dbname = postfix
query = SELECT domain FROM domain WHERE domain='%s' and backupmx = '1'

The error showing up in the logs is the following:

postfix/local[19002]: 38902E0550: to=<admin@domain.com>, relay=local, delay=0.09, delays=0.06/0.01/0/0.02, dsn=5.1.1, status=bounced (unknown user: "admin")

After reading some posts and I changed mydestination from this

mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

to 

mydestination = localhost

but after this change, I the error in the logs change to:

postfix/smtp[18844]: D6EEFE0550: to=<admin@domain.com>, relay=none, delay=0.14, delays=0.05/0.01/0.08/0, dsn=5.4.6, status=bounced (mail for domain.com loops back to myself)

Best Answer

If I were you, firstly I would backup mail.log then reverted all changes to the state from the tutorial, then I would add to main.cf:

debug_peer_level = 5
debug_peer_list = 127.0.0.1

then blanked mail.log cat /dev/null > /var/log/mail.log restarted postfix and manually connect to postfix (here is only the commands I would input):

telnet 127.0.0.1 25
ehlo 127.0.0.1
mail from: <my_email_at@gmail.com>
rcpt to: <admin@domain.com>
quit

then stopped postfix and analyze the logs. Searched for >>> CHECKING RECIPIENT MAPS <<< and looked below fir any errors.

One more question: only admin isn't working or any address ?

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