How to send an email to your own domain?

Question

postfix

Good day!
There is a server on ubuntu 16.04. The mail agent is postfix. Yandex mail is configured for the domain. The problem is that the letter is not sent to the addresses of its own domain.
Log:

Aug 24 17:34:50 networkerror postfix/local[18740]: 2B91C103203: to=<[email protected]>, relay=local, delay=1, delays=0.03/0.02/0/1, dsn=5.1.1, status=bounced (unknown user: "orders")

postfix config (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

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
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 = no

# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.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 defer_unauth_destination
myhostname = mydomain.ru
virtual_alias_maps = hash:/etc/postfix/virtual
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, mydomain.ru, localhost, localhost.localdomain, localhost, xx.xxx.xxx.xx

relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
compatibility_level = 2

Answer 1

What's wrong with the legend? He writes that there is no such mailbox.