2024-03-12 17:07:33 +01:00
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{ config, pkgs, ... }:
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let
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domain = config.networking.domain;
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hostname = "mail.${domain}";
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header_cleanup = pkgs.writeText "header_cleanup_outgoing" ''
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/^\s*(Received: from)[^\n]*(.*)/ REPLACE $1 127.0.0.1 (localhost [127.0.0.1])$2
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/^\s*User-Agent/ IGNORE
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/^\s*X-Enigmail/ IGNORE
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/^\s*X-Mailer/ IGNORE
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/^\s*X-Originating-IP/ IGNORE
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/^\s*Mime-Version/ IGNORE
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'';
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login_maps = pkgs.writeText "login_maps.pcre" ''
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# basic username => username@rfive.de
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/^([^@+]*)(\+[^@]*)?@rfive\.de$/ ''${1}
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'';
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in
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{
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networking.firewall.allowedTCPPorts = [
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25 # SMTP
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465 # SUBMISSONS
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];
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services = {
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postfix = {
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enable = true;
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enableSubmission = true;
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enableSubmissions = true;
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recipientDelimiter = "+";
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hostname = "${hostname}";
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domain = "${domain}";
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origin = "${domain}";
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destination = [ "${hostname}" "${domain}" "localhost" ];
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networks = [ "127.0.0.1" ];
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sslCert = "/var/lib/acme/${hostname}/fullchain.pem";
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sslKey = "/var/lib/acme/${hostname}/key.pem";
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config = {
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2024-05-20 12:25:13 +02:00
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# home_mailbox = "Maildir/";
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2024-03-12 17:07:33 +01:00
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smtp_helo_name = config.networking.fqdn;
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smtpd_banner = "${config.networking.fqdn} ESMTP $mail_name";
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smtp_use_tls = true;
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smtpd_use_tls = true;
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smtpd_tls_protocols = [
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"!SSLv2"
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"!SSLv3"
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"!TLSv1"
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"!TLSv1.1"
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];
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smtpd_recipient_restrictions = [
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"permit_sasl_authenticated"
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"permit_mynetworks"
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"reject_unauth_destination"
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"reject_non_fqdn_sender"
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"reject_non_fqdn_recipient"
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"reject_unknown_sender_domain"
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"reject_unknown_recipient_domain"
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"reject_unauth_destination"
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"reject_unauth_pipelining"
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"reject_invalid_hostname"
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];
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smtpd_relay_restrictions = [
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"permit_sasl_authenticated"
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"permit_mynetworks"
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"reject_unauth_destination"
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];
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smtpd_sender_restrictions = [
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"reject_authenticated_sender_login_mismatch"
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];
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smtpd_sender_login_maps = [ "pcre:${login_maps}" ];
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smtp_header_checks = "pcre:${header_cleanup}";
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alias_maps = [ "hash:/etc/aliases" ];
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smtpd_sasl_auth_enable = true;
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smtpd_sasl_path = "/var/lib/postfix/auth";
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smtpd_sasl_type = "dovecot";
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mailbox_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
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};
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};
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};
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}
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