Configuring Postfix to receive mail on Ubuntu?

Question

Mail server

Good day!
The site needs an SSL certificate,
to get the simplest one you need to receive mail on this domain.
It is important for me to receive mail (even just in a file).
I was looking for different instructions, but as I understood a lot of different implementations and too complicated for this task.
I also made a mess in the settings file))
Ubuntu server 14.04.4 LTS

myhostname = mail.test.site-name.ru

  mydomain = test.site-name.ru
  myorigin = test.site-name.ru

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

mail_spool_directory = /var/spool/mail
#myhostname = test.site-name.ru


local_recipient_maps =

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128



smtpd_etrn_restrictions = reject


disable_vrfy_command = yes


smtpd_helo_required = yes


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 = UNKNOWN

#  alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases
# mydestination = localdomain, localhost, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = loopback-only
inet_protocols = all
myorigin = /etc/mailname

Please tell me what needs to be changed in the settings, where to write the name of the mailbox and where to wait for incoming mail.
Thank you for attention.

Answer 1

www.iredmail.org