How to set up mailutils to receive emails and be able to reply to the recipient?

Question

linux

I welcome everyone!
I installed the mailutils utility, the letters are successfully sent, but when the recipient tries to answer, for example, in the Yandex mailbox, then there are already two recipients in the "to" field, this is my login name and my [email protected], after sending the letter is not delivered.
In the postfix configuration file, I changed only two fields:

append_dot_mydomain = yes // Тут было no
myhostname = linux.com // Было linux

PS postfix-a config:

# 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 = linux
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = linux, localhost.localdomain, , localhost
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

Answer 1

lay out the entire postfix config, and is the PTR record correctly spelled out? Are the MX records for the host correct?