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c260905c80
Exim spawns a new queue runner every n minutes as configured by the argument to -q; up to queue_run_max can be active at the same time. Spawning a queue runner only every 30 mins means that a message that failed delivery on the first attempt (e.g. due to greylisting) will only be retried 30 minutes later. A queue runner will immediately exit if the queue is empty, so it is more a function on how quickly Exim will scale to mail load and how quickly it will retry than something that is taxing on an otherwise empty system.
128 lines
3.1 KiB
Nix
128 lines
3.1 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) mkIf mkOption singleton types;
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inherit (pkgs) coreutils;
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cfg = config.services.exim;
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in
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{
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###### interface
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options = {
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services.exim = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable the Exim mail transfer agent.";
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};
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config = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Verbatim Exim configuration. This should not contain exim_user,
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exim_group, exim_path, or spool_directory.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "exim";
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description = ''
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User to use when no root privileges are required.
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In particular, this applies when receiving messages and when doing
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remote deliveries. (Local deliveries run as various non-root users,
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typically as the owner of a local mailbox.) Specifying this value
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as root is not supported.
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'';
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};
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group = mkOption {
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type = types.str;
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default = "exim";
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description = ''
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Group to use when no root privileges are required.
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'';
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};
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spoolDir = mkOption {
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type = types.path;
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default = "/var/spool/exim";
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description = ''
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Location of the spool directory of exim.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.exim;
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defaultText = "pkgs.exim";
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description = ''
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The Exim derivation to use.
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This can be used to enable features such as LDAP or PAM support.
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'';
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};
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queueRunnerInterval = mkOption {
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type = types.str;
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default = "5m";
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description = ''
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How often to spawn a new queue runner.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment = {
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etc."exim.conf".text = ''
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exim_user = ${cfg.user}
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exim_group = ${cfg.group}
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exim_path = /run/wrappers/bin/exim
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spool_directory = ${cfg.spoolDir}
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${cfg.config}
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'';
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systemPackages = [ cfg.package ];
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};
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users.users.${cfg.user} = {
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description = "Exim mail transfer agent user";
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uid = config.ids.uids.exim;
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group = cfg.group;
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};
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users.groups.${cfg.group} = {
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gid = config.ids.gids.exim;
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};
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security.wrappers.exim.source = "${cfg.package}/bin/exim";
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systemd.services.exim = {
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description = "Exim Mail Daemon";
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wantedBy = [ "multi-user.target" ];
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restartTriggers = [ config.environment.etc."exim.conf".source ];
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serviceConfig = {
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ExecStart = "${cfg.package}/bin/exim -bdf -q${cfg.queueRunnerInterval}";
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ExecReload = "${coreutils}/bin/kill -HUP $MAINPID";
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};
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preStart = ''
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if ! test -d ${cfg.spoolDir}; then
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${coreutils}/bin/mkdir -p ${cfg.spoolDir}
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${coreutils}/bin/chown ${cfg.user}:${cfg.group} ${cfg.spoolDir}
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fi
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'';
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};
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};
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}
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