How to connect to my smtp by domain?

Question

Python

Hello everyone, I set up my server on postfix, I can connect to it via ip ssh, this ip will not match the domain ip and if I connect via domain ip, it does not work, how can I fix it so that I can connect via my
mailer domain. mydomain.xyz
When I connect via domain I get this error:

ConnectionRefusedError: [WinError 10061] Подключение не установлено, т.к. конечный компьютер отверг запрос на подключение

Postfix config:

# 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

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
# fresh installs.
compatibility_level = 2



# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/certificate.crt
smtpd_tls_key_file=/etc/ssl/private/private.key
smtpd_tls_security_level=may

smtp_tls_CApath=/etc/ssl/certs
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache


smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = mydomain.xyz
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = mydomain.xyz, mailer.mydomain.xyz, localhost.mydomain.xyz, , localhost
relayhost =
#mynetworks = 127.0.0.0/8 10.0.0.0/8 172.0.0.0/8 [::]/128 [::ffff:127.0.0.0]/104 [::1]/128
mynetworks = 0.0.0.0/0 , 127.0.0.0/8
mailbox_command =
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
home_mailbox = Maildir/
virtual_alias_maps = hash:/etc/postfix/virtual
smtpd_use_tls = yes
mynetworks_style = subnet

Answer 1

In the settings where the domain is registered, register the desired IP for the domain

Answer 2

os, as I understand it, Windows ??
register on the machine with which you knock on the mailer.
%нужный ип% %нужный домен%
to the hosts file , and then the desired domain will always resolve to the desired ip, bypassing all DNS systems.