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Add mailing list members to recipient_bcc_maps instead of virtual_alias_maps #679

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Add mailing list members to recipient_bcc_maps instead of virtual_alias_maps #679

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31 changes: 24 additions & 7 deletions non-critical-infra/modules/mailserver/mailing-lists-options.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,12 @@
# 2. We can set up a login account for mailing addresses to allow sending
# email via `SMTP` from those addresses.

{ config, lib, ... }:
{
pkgs,
config,
lib,
...
}:

let
inherit (lib) types;
Expand Down Expand Up @@ -112,7 +117,21 @@ in
}) secretPasswordFiles)
);

sops.templates."postfix-virtual-mailing-lists" = {
# Create virtual_alias_maps for every mailing list. Note: these are
# intentionally empty entries, all members of the mailing lists actually end
# up in `recipient_bcc_maps`, so bounces don't get sent back to the
# original sender (and thereby leak email addresses in our mailing lists).
services.postfix.mapFiles.virtual-alias-maps = pkgs.writeTextFile {
name = "virtual-alias-maps";
text = lib.concatStringsSep "\n" (
lib.mapAttrsToList (name: _members: name) listsWithSecretPlaceholders
);
};
services.postfix.config.virtual_alias_maps = [ "hash:/etc/postfix/virtual-alias-maps" ];

# BCC the members of our mailing lists. This is to avoid leaking membership
# email addresses. See note above for details.
sops.templates."postfix-recipient-bcc-maps" = {
content = lib.concatStringsSep "\n" (
lib.mapAttrsToList (
name: members: "${name} ${lib.concatStringsSep ", " members}"
Expand All @@ -125,10 +144,8 @@ in
# paths": https://github.com/Mic92/sops-nix/issues/648
restartUnits = [ "postfix-setup.service" ];
};

services.postfix.mapFiles.virtual-mailing-lists =
config.sops.templates."postfix-virtual-mailing-lists".path;

services.postfix.config.virtual_alias_maps = [ "hash:/etc/postfix/virtual-mailing-lists" ];
services.postfix.mapFiles.recipient-bcc-maps =
config.sops.templates."postfix-recipient-bcc-maps".path;
services.postfix.config.recipient_bcc_maps = [ "hash:/etc/postfix/postfix-recipient-bcc-maps" ];
};
}