| 1 | { |
| 2 | inputs, |
| 3 | config, |
| 4 | lib, |
| 5 | pkgs, |
| 6 | ... |
| 7 | }: |
| 8 | |
| 9 | { |
| 10 | imports = [ |
| 11 | inputs.simple-nixos-mailserver.nixosModule |
| 12 | ./mailing-lists.nix |
| 13 | ./freescout.nix |
| 14 | ]; |
| 15 | |
| 16 | # enabled through systemd.network.enable |
| 17 | services.resolved.enable = false; |
| 18 | |
| 19 | services.nginx = { |
| 20 | enable = true; |
| 21 | virtualHosts.${config.mailserver.fqdn} = { |
| 22 | enableACME = true; |
| 23 | forceSSL = true; |
| 24 | locations."/".return = "204"; |
| 25 | }; |
| 26 | }; |
| 27 | |
| 28 | mailserver = { |
| 29 | enable = true; |
| 30 | enableImap = false; |
| 31 | stateVersion = 3; |
| 32 | |
| 33 | fqdn = config.networking.fqdn; |
| 34 | |
| 35 | x509.useACMEHost = config.mailserver.fqdn; |
| 36 | |
| 37 | domains = [ |
| 38 | "nixcon.org" |
| 39 | "nixos.org" |
| 40 | ]; |
| 41 | |
| 42 | dkim.domains = |
| 43 | let |
| 44 | selectors = { |
| 45 | "mail" = { |
| 46 | # legacy managed key |
| 47 | }; |
| 48 | "r202605" = { |
| 49 | keyType = "rsa"; |
| 50 | keyLength = 2048; |
| 51 | }; |
| 52 | "e202605" = { |
| 53 | keyType = "ed25519"; |
| 54 | keyLength = null; |
| 55 | }; |
| 56 | }; |
| 57 | in |
| 58 | lib.genAttrs config.mailserver.domains (_: { |
| 59 | inherit selectors; |
| 60 | }); |
| 61 | |
| 62 | srs.enable = true; |
| 63 | }; |
| 64 | |
| 65 | # https://nixos-mailserver.readthedocs.io/en/latest/backup-guide.html |
| 66 | services.backup.includes = [ config.mailserver.storage.path ]; |
| 67 | |
| 68 | sops.secrets."nixos.org.mail.key" = { |
| 69 | format = "binary"; |
| 70 | owner = "rspamd"; |
| 71 | group = "rspamd"; |
| 72 | mode = "0600"; |
| 73 | |
| 74 | # How to generate: |
| 75 | # |
| 76 | # ```console |
| 77 | # cd non-critical-infra |
| 78 | # DOMAIN=nixos.org |
| 79 | # SELECTOR=mail |
| 80 | # PRIVATE_KEY_PATH=secrets/$DOMAIN.$SELECTOR.key.umbriel |
| 81 | # nix shell nixpkgs#opendkim --command opendkim-genkey --selector="$SELECTOR" --domain="$DOMAIN" --bits=1024 |
| 82 | # mv mail.private "$PRIVATE_KEY_PATH" |
| 83 | # sops encrypt --in-place "$PRIVATE_KEY_PATH" |
| 84 | # ``` |
| 85 | # |
| 86 | # Next, look at `mail.txt` and update DNS accordingly. |
| 87 | sopsFile = ../../secrets/nixos.org.mail.key.umbriel; |
| 88 | |
| 89 | # Ensure the file gets symlinked to where Simple NixOS Mailserver expects |
| 90 | # to find it. |
| 91 | path = "${config.mailserver.dkim.keyDirectory}/nixos.org.mail.key"; |
| 92 | }; |
| 93 | |
| 94 | sops.secrets."nixcon.org.mail.key" = { |
| 95 | format = "binary"; |
| 96 | owner = "rspamd"; |
| 97 | group = "rspamd"; |
| 98 | mode = "0600"; |
| 99 | sopsFile = ../../secrets/nixcon.org.mail.key.umbriel; |
| 100 | path = "${config.mailserver.dkim.keyDirectory}/nixcon.org.mail.key"; |
| 101 | }; |
| 102 | |
| 103 | services.postfix.settings.main.bounce_template_file = "${pkgs.writeText "bounce-template.cf" '' |
| 104 | failure_template = <<EOF |
| 105 | Charset: us-ascii |
| 106 | From: MAILER-DAEMON (Mail Delivery System) |
| 107 | Subject: Undelivered Mail Returned to Sender |
| 108 | Postmaster-Subject: Postmaster Copy: Undelivered Mail |
| 109 | |
| 110 | This is the mail system at host $myhostname. |
| 111 | |
| 112 | I'm sorry to have to inform you that your message could not |
| 113 | be delivered to one or more recipients. It's attached below. |
| 114 | |
| 115 | For further assistance, please file an issue at |
| 116 | https://github.com/NixOS/infra/issues/new. Please anonymize any personal |
| 117 | email addresses in your report. |
| 118 | |
| 119 | If you do so, please include this problem report. You can |
| 120 | delete your own text from the attached returned message. |
| 121 | |
| 122 | The mail system |
| 123 | EOF |
| 124 | |
| 125 | delay_template = <<EOF |
| 126 | Charset: us-ascii |
| 127 | From: MAILER-DAEMON (Mail Delivery System) |
| 128 | Subject: Delayed Mail (still being retried) |
| 129 | Postmaster-Subject: Postmaster Warning: Delayed Mail |
| 130 | |
| 131 | This is the mail system at host $myhostname. |
| 132 | |
| 133 | #################################################################### |
| 134 | # THIS IS A WARNING ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. # |
| 135 | #################################################################### |
| 136 | |
| 137 | Your message could not be delivered for more than $delay_warning_time_hours hour(s). |
| 138 | It will be retried until it is $maximal_queue_lifetime_days day(s) old. |
| 139 | |
| 140 | For further assistance, please file an issue at |
| 141 | https://github.com/NixOS/infra/issues/new. Please anonymize any personal |
| 142 | email addresses in your report. |
| 143 | |
| 144 | If you do so, please include this problem report. You can |
| 145 | delete your own text from the attached returned message. |
| 146 | |
| 147 | The mail system |
| 148 | EOF |
| 149 | ''}"; |
| 150 | |
| 151 | services.postsrsd.secretsFile = config.sops.secrets.postsrsd-secret.path; |
| 152 | |
| 153 | # ``` |
| 154 | # How to generate: |
| 155 | # |
| 156 | # ```console |
| 157 | # cd non-critical-infra |
| 158 | # SECRET_PATH=secrets/postsrsd-secret.umbriel |
| 159 | # dd if=/dev/random bs=18 count=1 status=none | base64 > "$SECRET_PATH" |
| 160 | # sops encrypt --in-place "$SECRET_PATH" |
| 161 | # ``` |
| 162 | sops.secrets.postsrsd-secret = { |
| 163 | format = "binary"; |
| 164 | owner = config.services.postsrsd.user; |
| 165 | group = config.services.postsrsd.group; |
| 166 | sopsFile = ../../secrets/postsrsd-secret.umbriel; |
| 167 | restartUnits = [ "postsrsd.service" ]; |
| 168 | }; |
| 169 | } |