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{ config, lib, pkgs, ... }:
with lib;
let
name = "maddy";
cfg = config.services.maddy;
defaultConfig = ''
# Minimal configuration with TLS disabled, adapted from upstream example
# configuration here https://github.com/foxcpp/maddy/blob/master/maddy.conf
# Do not use this in production!
tls off
auth.pass_table local_authdb {
table sql_table {
driver sqlite3
dsn credentials.db
table_name passwords
}
}
storage.imapsql local_mailboxes {
driver sqlite3
dsn imapsql.db
}
table.chain local_rewrites {
optional_step regexp "(.+)\+(.+)@(.+)" "$1@$3"
optional_step static {
entry postmaster postmaster@$(primary_domain)
}
optional_step file /etc/maddy/aliases
}
msgpipeline local_routing {
destination postmaster $(local_domains) {
modify {
replace_rcpt &local_rewrites
}
deliver_to &local_mailboxes
}
default_destination {
reject 550 5.1.1 "User doesn't exist"
}
}
smtp tcp://0.0.0.0:25 {
limits {
all rate 20 1s
all concurrency 10
}
dmarc yes
check {
require_mx_record
dkim
spf
}
source $(local_domains) {
reject 501 5.1.8 "Use Submission for outgoing SMTP"
}
default_source {
destination postmaster $(local_domains) {
deliver_to &local_routing
}
default_destination {
reject 550 5.1.1 "User doesn't exist"
}
}
}
submission tcp://0.0.0.0:587 {
limits {
all rate 50 1s
}
auth &local_authdb
source $(local_domains) {
check {
authorize_sender {
prepare_email &local_rewrites
user_to_email identity
}
}
destination postmaster $(local_domains) {
deliver_to &local_routing
}
default_destination {
modify {
dkim $(primary_domain) $(local_domains) default
}
deliver_to &remote_queue
}
}
default_source {
reject 501 5.1.8 "Non-local sender domain"
}
}
target.remote outbound_delivery {
limits {
destination rate 20 1s
destination concurrency 10
}
mx_auth {
dane
mtasts {
cache fs
fs_dir mtasts_cache/
}
local_policy {
min_tls_level encrypted
min_mx_level none
}
}
}
target.queue remote_queue {
target &outbound_delivery
autogenerated_msg_domain $(primary_domain)
bounce {
destination postmaster $(local_domains) {
deliver_to &local_routing
}
default_destination {
reject 550 5.0.0 "Refusing to send DSNs to non-local addresses"
}
}
}
imap tcp://0.0.0.0:143 {
auth &local_authdb
storage &local_mailboxes
}
'';
in {
options = {
services.maddy = {
enable = mkEnableOption (lib.mdDoc "Maddy, a free an open source mail server");
user = mkOption {
default = "maddy";
type = with types; uniq string;
description = ''
User account under which maddy runs.
<note><para>
If left as the default value this user will automatically be created
on system activation, otherwise the sysadmin is responsible for
ensuring the user exists before the maddy service starts.
</para></note>
'';
};
group = mkOption {
default = "maddy";
type = with types; uniq string;
description = ''
Group account under which maddy runs.
<note><para>
If left as the default value this group will automatically be created
on system activation, otherwise the sysadmin is responsible for
ensuring the group exists before the maddy service starts.
</para></note>
'';
};
hostname = mkOption {
default = "localhost";
type = with types; uniq string;
example = ''example.com'';
description = lib.mdDoc ''
Hostname to use. It should be FQDN.
'';
};
primaryDomain = mkOption {
default = "localhost";
type = with types; uniq string;
example = ''mail.example.com'';
description = lib.mdDoc ''
Primary MX domain to use. It should be FQDN.
'';
};
localDomains = mkOption {
type = with types; listOf str;
default = ["$(primary_domain)"];
example = [
"$(primary_domain)"
"example.com"
"other.example.com"
];
description = lib.mdDoc ''
Define list of allowed domains.
'';
};
config = mkOption {
type = with types; nullOr lines;
default = defaultConfig;
description = ''
Server configuration, see
<link xlink:href="https://maddy.email">https://maddy.email</link> for
more information. The default configuration of this module will setup
minimal maddy instance for mail transfer without TLS encryption.
<note><para>
This should not be used in a production environment.
</para></note>
'';
};
openFirewall = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Open the configured incoming and outgoing mail server ports.
'';
};
};
};
config = mkIf cfg.enable {
systemd = {
packages = [ pkgs.maddy ];
services.maddy = {
serviceConfig = {
User = cfg.user;
Group = cfg.group;
StateDirectory = [ "maddy" ];
};
restartTriggers = [ config.environment.etc."maddy/maddy.conf".source ];
wantedBy = [ "multi-user.target" ];
};
};
environment.etc."maddy/maddy.conf" = {
text = ''
$(hostname) = ${cfg.hostname}
$(primary_domain) = ${cfg.primaryDomain}
$(local_domains) = ${toString cfg.localDomains}
hostname ${cfg.hostname}
${cfg.config}
'';
};
users.users = optionalAttrs (cfg.user == name) {
${name} = {
isSystemUser = true;
group = cfg.group;
description = "Maddy mail transfer agent user";
};
};
users.groups = optionalAttrs (cfg.group == name) {
${cfg.group} = { };
};
networking.firewall = mkIf cfg.openFirewall {
allowedTCPPorts = [ 25 143 587 ];
};
environment.systemPackages = [
pkgs.maddy
];
};
}
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