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nixos/exim: Make queue runner interval configurable and reduce it to 5m

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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.
This commit is contained in:
Philipp Kern 2020-12-25 20:56:41 +01:00
parent 1e2571ac21
commit c260905c80
1 changed files with 8 additions and 1 deletions
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9
nixos/modules/services/mail/exim.nix
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@ -67,6 +67,13 @@ in
'';
};
queueRunnerInterval = mkOption {
type = types.str;
default = "5m";
description = ''
How often to spawn a new queue runner.
'';
};
};
};
@ -104,7 +111,7 @@ in
wantedBy = [ "multi-user.target" ];
restartTriggers = [ config.environment.etc."exim.conf".source ];
serviceConfig = {
ExecStart = "${cfg.package}/bin/exim -bdf -q30m";
ExecStart = "${cfg.package}/bin/exim -bdf -q${cfg.queueRunnerInterval}";
ExecReload = "${coreutils}/bin/kill -HUP $MAINPID";
};
preStart = ''