Usando o Ubuntu 24.04 LTS. Verifiquei que minha chave de certificado está correta. Também não mostra a porta 465 escutando, mas a regra do firewall está lá.
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 $mail_name (Ubuntu)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
# fresh installs.
compatibility_level = 3.6
# TLS parameters
smtpd_tls_cert_file = /etc/ssl/certs/mailserver.crt
smtpd_tls_key_file = /etc/ssl/private/mailserver.key
smtpd_tls_security_level = may
smtpd_tls_auth_only = yes
smtp_tls_security_level = may
# smtp_tls_CApath = /etc/ssl/certs/
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = *****.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, ******.com, localhost.com, , 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
smtps inet n - - - - smtpd
-o syslog_name=postfix/smtps
-o smtpd_tls_security_level=encrypt
-o smtpd_sasl_auth_enable=yes
-o smtpd_tls_wrappermode=yes
-o smtpd_reject_unlisted_recipient=no
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
-o smtpd_helo_restrictions=permit_mynetworks,reject_invalid_helo_hostname,reject_non_fqdn_helo_hostname
-o smtpd_sender_restrictions=permit_mynetworks,reject_non_fqdn_sender,reject_unknown_sender_domain
-o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
-o milter_macro_daemon_name=ORIGINATING
root@*******:/etc/postfix#
Você está usando o arquivo errado para adicionar suas declarações de ouvinte e coisas assim.
Sua
smtps inet n - - - - smtpd ...
seção precisa ser feita emmaster.cf
notmain.cf
.Edite/modifique a
smtps
linha em/etc/postfix/master.cf
vez de/etc/postfix/main.cf
e remova essas curtidas demain.cf
.Você deverá então conseguir reiniciar o servidor Postfix.