nixpkgs/nixos/modules/programs/ssmtp.nix

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# Configuration for `ssmtp', a trivial mail transfer agent that can
# replace sendmail/postfix on simple systems. It delivers email
# directly to an SMTP server defined in its configuration file, wihout
# queueing mail locally.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.networking.defaultMailServer;
in
{
options = {
networking.defaultMailServer = {
directDelivery = mkOption {
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type = types.bool;
default = false;
description = ''
Use the trivial Mail Transfer Agent (MTA)
<command>ssmtp</command> package to allow programs to send
e-mail. If you don't want to run a real MTA like
<command>sendmail</command> or <command>postfix</command> on
your machine, set this option to <literal>true</literal>, and
set the option
<option>networking.defaultMailServer.hostName</option> to the
host name of your preferred mail server.
'';
};
hostName = mkOption {
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type = types.str;
example = "mail.example.org";
description = ''
The host name of the default mail server to use to deliver
e-mail. Can also contain a port number (ex: mail.example.org:587),
defaults to port 25 if no port is given.
'';
};
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root = mkOption {
type = types.str;
default = "";
example = "root@example.org";
description = ''
The e-mail to which mail for users with UID &lt; 1000 is forwarded.
'';
};
domain = mkOption {
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type = types.str;
default = "";
example = "example.org";
description = ''
The domain from which mail will appear to be sent.
'';
};
useTLS = mkOption {
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type = types.bool;
default = false;
description = ''
Whether TLS should be used to connect to the default mail
server.
'';
};
useSTARTTLS = mkOption {
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type = types.bool;
default = false;
description = ''
Whether the STARTTLS should be used to connect to the default
mail server. (This is needed for TLS-capable mail servers
running on the default SMTP port 25.)
'';
};
authUser = mkOption {
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type = types.str;
default = "";
example = "foo@example.org";
description = ''
Username used for SMTP auth. Leave blank to disable.
'';
};
authPass = mkOption {
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type = types.str;
default = "";
example = "correctHorseBatteryStaple";
description = ''
Password used for SMTP auth. (STORED PLAIN TEXT, WORLD-READABLE IN NIX STORE)
It's recommended to use <option>authPassFile</option>
which takes precedence over <option>authPass</option>.
'';
};
authPassFile = mkOption {
type = types.nullOr types.str;
default = null;
example = "/run/keys/ssmtp-authpass";
description = ''
Path to a file that contains the password used for SMTP auth. The file
should not contain a trailing newline, if the password does not contain one.
This file should be readable by the users that need to execute ssmtp.
<option>authPassFile</option> takes precedence over <option>authPass</option>.
Warning: when <option>authPass</option> is non-empty <option>authPassFile</option>
defaults to a file in the WORLD-READABLE Nix store containing that password.
'';
};
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setSendmail = mkOption {
type = types.bool;
default = true;
description = "Whether to set the system sendmail to ssmtp's.";
};
};
};
config = mkIf cfg.directDelivery {
networking.defaultMailServer.authPassFile = mkIf (cfg.authPass != "")
(mkDefault (toString (pkgs.writeTextFile {
name = "ssmtp-authpass";
text = cfg.authPass;
})));
environment.etc."ssmtp/ssmtp.conf".text =
let yesNo = yes : if yes then "YES" else "NO"; in
''
MailHub=${cfg.hostName}
FromLineOverride=YES
${optionalString (cfg.root != "") "root=${cfg.root}"}
${optionalString (cfg.domain != "") "rewriteDomain=${cfg.domain}"}
UseTLS=${yesNo cfg.useTLS}
UseSTARTTLS=${yesNo cfg.useSTARTTLS}
#Debug=YES
${optionalString (cfg.authUser != "") "AuthUser=${cfg.authUser}"}
${optionalString (!isNull cfg.authPassFile) "AuthPassFile=${cfg.authPassFile}"}
'';
environment.systemPackages = [pkgs.ssmtp];
services.mail.sendmailSetuidWrapper = mkIf cfg.setSendmail {
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program = "sendmail";
source = "${pkgs.ssmtp}/bin/sendmail";
setuid = false;
setgid = false;
};
};
}