Greetings, I have found myself with the task of moving/recreating the mail server of a small ngo from an old VPS which hasn't been updated for years but still works without any visible problem, to a new one.
The current server runs postfix 2.10.1 + postgrey on Centos 7.6. The new server should run the current stable version of Postfix (3.9, right?) on (almost surely) Ubuntu 24.04 LTS, and the same fixed IP as today, with the same load as today (7/8 domains, but with very few users) I would need, in order to minimize downtime, to know in advance what exactly I should change in the several postfix configuration files and connected "tools", e.g. certbot certificates. That is, I am pretty sure I cannot just copy the whole content of /etc/postfix (see below) from the old VPS to the new one and expect things to work, but what should I change? And what input should I provide, besides the output of postconf -n below? Thanks in advance for your support, Marco alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin xxgdb $daemon_directory/$process_name $process_id & sleep 5 disable_vrfy_command = yes html_directory = /usr/share/doc/postfix-2.4.3-documentation/html inet_interfaces = all inet_protocols = ipv4 mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man message_size_limit = 20480000 mydestination = $myhostname, localhost mydomain = $myhostname myhostname = a.mx.NGO-DOMAIN-NAME mynetworks = 127.0.0.0/8, 47.53.159.60 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix non_smtpd_milters = inet:localhost:8891 procmail_destination_recipient_limit = 1 queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.4.3-documentation/readme relay_domains = sample_directory = /etc/postfix sender_dependent_relayhost_maps = hash:/etc/postfix/mymaps/relayhost_maps sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_address_preference = ipv4 smtp_sasl_auth_enable = yes smtp_sasl_mechanism_filter = smtp_sasl_password_maps = hash:/etc/postfix/mymaps/sasl_passwd smtp_sasl_security_options = noanonymous smtp_sasl_tls_security_options = noanonymous smtp_sasl_type = cyrus smtp_sender_dependent_authentication = yes smtp_tls_mandatory_ciphers = high smtp_tls_security_level = may smtpd_helo_required = yes smtpd_helo_restrictions = smtpd_milters = inet:localhost:8891 smtpd_recipient_restrictions = check_client_access cidr:/etc/postfix/client_checks, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_helo_access hash:/etc/postfix/reject_own_helo, check_policy_service unix:postgrey/socket smtpd_sasl_auth_enable = yes smtpd_sasl_path = /var/spool/postfix/private/auth smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/letsencrypt/live/NGO-DOMAIN-NAME/fullchain.pem smtpd_tls_ciphers = medium smtpd_tls_exclude_ciphers = SSLv2, aNULL, ADH, eNULL smtpd_tls_key_file = /etc/letsencrypt/live/NGO-DOMAIN-NAME/privkey.pem smtpd_tls_loglevel = 1 smtpd_tls_security_level = may smtpd_use_tls = yes strict_rfc821_envelopes = yes unknown_address_reject_code = 554 unknown_client_reject_code = 554 unknown_hostname_reject_code = 554 unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/mymaps/valias.map virtual_gid_maps = static:5000 virtual_mailbox_base = /var/mail/mymail_storage virtual_mailbox_domains = /etc/postfix/mymaps/vhosts.map virtual_mailbox_maps = hash:/etc/postfix/mymaps/vmailboxes.map virtual_transport = procmail virtual_uid_maps = static:1001
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