flake.nix

@@ -44,7 +44,7 @@
         quitte = self.nixosConfigurations.quitte.config.system.build.toplevel;
         tomate = self.nixosConfigurations.tomate.config.system.build.toplevel;
       });
-      formatters = forAllSystems (system: rec {
+      formatters = forAllSystems (system: {
         default = pkgs.${system}.nixpkgs-fmt;
       });
       hydraJobs = forAllSystems (system: {
@@ -96,7 +96,6 @@
             ./modules/nextcloud.nix
             ./modules/matrix.nix
             ./modules/mautrix-telegram.nix
-            ./modules/sogo.nix
             ./modules/vaultwarden.nix
             ./modules/website.nix
             ./modules/zsh.nix

modules/mail/default.nix

@@ -1,426 +1,25 @@
-{ config, pkgs, ... }:
+{ config, ... }:
 let
   hostname = "mail.${config.networking.domain}";
-  domain = config.networking.domain;
-  rspamd-domain = "rspamd.${config.networking.domain}";
-  dovecot-ldap-args = pkgs.writeText "ldap-args" ''
-    uris = ldap://localhost
-    dn = uid=search, ou=users, dc=ifsr, dc=de
-    auth_bind = yes
-    !include ${config.sops.secrets."dovecot_ldap_search".path}
-
-    ldap_version = 3
-    scope = subtree
-    base = dc=ifsr, dc=de
-    user_filter = (&(objectClass=posixAccount)(uid=%n))
-    pass_filter = (&(objectClass=posixAccount)(uid=%n))
-  '';
-  # see https://www.kuketz-blog.de/e-mail-anbieter-ip-stripping-aus-datenschutzgruenden/
-  header_cleanup = pkgs.writeText "header_cleanup_outgoing" ''
-    /^\s*(Received: from)[^\n]*(.*)/ REPLACE $1 127.0.0.1 (localhost [127.0.0.1])$2
-    /^\s*User-Agent/ IGNORE
-    /^\s*X-Enigmail/ IGNORE
-    /^\s*X-Mailer/ IGNORE
-    /^\s*X-Originating-IP/ IGNORE
-    /^\s*Mime-Version/ IGNORE
-  '';
-  # https://unix.stackexchange.com/questions/294300/postfix-prevent-users-from-changing-the-real-e-mail-address
-  login_maps = pkgs.writeText "login_maps.pcre" ''
-    # basic username => username@ifsr.de
-    /^([^@+]*)(\+[^@]*)?@ifsr\.de$/ ''${1}
-  '';
 in
 {
-  sops.secrets."rspamd-password".owner = config.users.users.rspamd.name;
+  imports = [
-  sops.secrets."dovecot_ldap_search".owner = config.services.dovecot2.user;
+    ./postfix.nix
-  sops.secrets."postfix_ldap_aliases".owner = config.services.postfix.user;
+    ./dovecot2.nix
-
+    ./rspamd.nix
-  networking.firewall.allowedTCPPorts = [
+    ./sogo.nix
-    25 # insecure SMTP
+    ./mailman.nix
-    143
-    465
-    587 # SMTP
-    993 # IMAP
-    4190 # sieve
   ];
-  users.users.rspamd.extraGroups = [ "redis-rspamd" ];
-  environment.etc = {
-    "dovecot/sieve-pipe/sa-learn-spam.sh" = {
-      text = ''
-        #!/bin/sh
-        ${pkgs.rspamd}/bin/rspamc learn_spam
-      '';
-      mode = "0555";
-    };
-    "dovecot/sieve-pipe/sa-learn-ham.sh" = {
-      text = ''
-        #!/bin/sh
-        ${pkgs.rspamd}/bin/rspamc learn_ham
-      '';
-      mode = "0555";
-    };
-    "dovecot/sieve/report-spam.sieve" = {
-      source = ./report-spam.sieve;
-      user = "dovecot2";
-      group = "dovecot2";
-      mode = "0544";
-    };
-    "dovecot/sieve/report-ham.sieve" = {
-      source = ./report-ham.sieve;
-      user = "dovecot2";
-      group = "dovecot2";
-      mode = "0544";
-    };
-  };
 
-  services = {
+  # Get SSL certs for dovecot and postfix via ngnix
-    postfix = {
+  services.nginx.virtualHosts."${hostname}" = {
-      enable = true;
-      enableSubmission = true;
-      enableSubmissions = true;
-      hostname = "${hostname}";
-      domain = "${domain}";
-      origin = "${domain}";
-      destination = [ "${hostname}" "${domain}" "localhost" ];
-      networksStyle = "host"; # localhost and own public IP
-      sslCert = "/var/lib/acme/${hostname}/fullchain.pem";
-      sslKey = "/var/lib/acme/${hostname}/key.pem";
-      relayDomains = [ "hash:/var/lib/mailman/data/postfix_domains" ];
-      config = {
-        home_mailbox = "Maildir/";
-        # 25 MiB
-        message_size_limit = "26214400";
-        # hostname used in helo command. It is recommended to have this match the reverse dns entry
-        smtp_helo_name = config.networking.rDNS;
-        smtpd_banner = "${config.networking.rDNS} ESMTP $mail_name";
-        smtp_use_tls = true;
-        # smtp_tls_security_level = "encrypt";
-        smtpd_use_tls = true;
-        # smtpd_tls_security_level = lib.mkForce "encrypt";
-        # smtpd_tls_auth_only = true;
-        smtpd_tls_protocols = [
-          "!SSLv2"
-          "!SSLv3"
-          "!TLSv1"
-          "!TLSv1.1"
-        ];
-        # "reject_non_fqdn_hostname"
-        smtpd_recipient_restrictions = [
-          "permit_sasl_authenticated"
-          "permit_mynetworks"
-          "reject_unauth_destination"
-          "reject_non_fqdn_sender"
-          "reject_non_fqdn_recipient"
-          "reject_unknown_sender_domain"
-          "reject_unknown_recipient_domain"
-          "reject_unauth_destination"
-          "reject_unauth_pipelining"
-          "reject_invalid_hostname"
-          "check_policy_service inet:localhost:12340"
-        ];
-        smtpd_relay_restrictions = [
-          "permit_sasl_authenticated"
-          "permit_mynetworks"
-          "reject_unauth_destination"
-        ];
-        # https://www.postfix.org/smtp-smuggling.html
-        smtpd_data_restrictions = [
-          "reject_unauth_pipelining"
-        ];
-        smtpd_sender_restrictions = [
-          "reject_authenticated_sender_login_mismatch"
-        ];
-        smtpd_sender_login_maps = [
-          "pcre:/etc/special-aliases.pcre"
-          "pcre:${login_maps}"
-        ];
-        smtp_header_checks = "pcre:${header_cleanup}";
-        # smtpd_sender_login_maps = [ "ldap:${ldap-senders}" ];
-        alias_maps = [ "hash:/etc/aliases" ];
-        alias_database = [ "hash:/etc/aliases" ];
-        # alias_maps = [ "hash:/etc/aliases" "ldap:${ldap-aliases}" ];
-        smtpd_sasl_auth_enable = true;
-        smtpd_sasl_path = "/var/lib/postfix/auth";
-        smtpd_sasl_type = "dovecot";
-        #mailman stuff
-        mailbox_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
-
-        transport_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];
-        virtual_alias_maps = [ "hash:/var/lib/mailman/data/postfix_vmap" ];
-        local_recipient_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" "ldap:${config.sops.secrets."postfix_ldap_aliases".path}" "$alias_maps" ];
-      };
-    };
-    dovecot2 = {
-      enable = true;
-      enableImap = true;
-      enableQuota = true;
-      quotaGlobalPerUser = "10G";
-      enableLmtp = true;
-      enablePAM = false;
-      mailLocation = "maildir:~/Maildir";
-      sslServerCert = "/var/lib/acme/${hostname}/fullchain.pem";
-      sslServerKey = "/var/lib/acme/${hostname}/key.pem";
-      protocols = [ "imap" "sieve" ];
-      mailPlugins = {
-        globally.enable = [ "listescape" ];
-        perProtocol = {
-          imap = {
-            enable = [ "imap_sieve" "imap_filter_sieve" ];
-          };
-          lmtp = {
-            enable = [ "sieve" ];
-          };
-        };
-      };
-      mailboxes = {
-        Spam = {
-          auto = "subscribe";
-          specialUse = "Junk";
-          autoexpunge = "60d";
-        };
-        Sent = {
-          auto = "subscribe";
-          specialUse = "Sent";
-        };
-        Drafts = {
-          auto = "subscribe";
-          specialUse = "Drafts";
-        };
-        Trash = {
-          auto = "subscribe";
-          specialUse = "Trash";
-        };
-        Archive = {
-          auto = "no";
-          specialUse = "Archive";
-        };
-      };
-      modules = [
-        pkgs.dovecot_pigeonhole
-      ];
-      # set to satisfy the sieveScripts check, will be overridden by userdb lookups anyways
-      mailUser = "vmail";
-      mailGroup = "vmail";
-      sieveScripts = {
-        before = pkgs.writeText "spam.sieve" ''
-          require "fileinto";
-
-          if anyof(
-          header :contains "x-spam-flag" "yes",
-          header :contains "X-Spam-Status" "Yes"){
-                  fileinto "Spam";
-          }
-        '';
-      };
-      extraConfig = ''
-        auth_username_format = %Ln
-        passdb {
-          driver = ldap
-          args = ${dovecot-ldap-args}
-        }
-        userdb {
-          driver = ldap
-          args = ${dovecot-ldap-args}
-        }
-        service auth {
-          unix_listener /var/lib/postfix/auth {
-            group = postfix
-            mode = 0660
-            user = postfix
-          }
-        }
-        service managesieve-login {
-          inet_listener sieve {
-            port = 4190
-          }
-          service_count = 1
-        }
-
-        namespace inbox {
-          separator = /
-          inbox = yes
-        }
-
-        service lmtp {
-          unix_listener dovecot-lmtp {
-            group = postfix
-            mode = 0600
-            user = postfix
-          }
-          client_limit = 1
-        }
-
-
-        plugin {
-          sieve_plugins = sieve_imapsieve sieve_extprograms
-          sieve_global_extensions = +vnd.dovecot.pipe
-          sieve_pipe_bin_dir = /etc/dovecot/sieve-pipe
-
-          # Spam: From elsewhere to Spam folder or flag changed in Spam folder
-          imapsieve_mailbox1_name = Spam
-          imapsieve_mailbox1_causes = COPY APPEND FLAG
-          imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve
-
-          # Ham: From Spam folder to elsewhere
-          imapsieve_mailbox2_name = *
-          imapsieve_mailbox2_from = Spam
-          imapsieve_mailbox2_causes = COPY
-          imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve
-
-          # https://doc.dovecot.org/configuration_manual/plugins/listescape_plugin/
-          listescape_char = "\\"
-        }
-      '';
-    };
-    rspamd = {
-      enable = true;
-      postfix.enable = true;
-      locals = {
-        "worker-controller.inc".source = config.sops.secrets."rspamd-password".path;
-        "redis.conf".text = ''
-          read_servers = "/run/redis-rspamd/redis.sock";
-          write_servers = "/run/redis-rspamd/redis.sock";
-        '';
-        # headers in spamassasin style to not break old sieve scripts
-        "worker-proxy.inc".text = ''
-          spam_header = "X-Spam-Flag";
-        '';
-        "milter_headers.conf".text = ''
-          use = ["x-spam-level", "x-spam-status", "x-spamd-result", "authentication-results" ];
-        '';
-        "neural.conf".text = ''
-          servers = "/run/redis-rspamd/redis.sock";
-          enabled = true;
-        '';
-        "neural_group.conf".text = ''
-          symbols = {
-            "NEURAL_SPAM" {
-              weight = 0.5; # fairly low weight since we don't know how this will behave
-              description = "Neural network spam";
-            }
-            "NEURAL_HAM" {
-              weight = -0.5;
-              description = "Neural network ham";
-            }
-          }
-        '';
-        "dmarc.conf".text = ''
-          reporting {
-            enabled = true;
-            email = 'reports@${config.networking.domain}';
-            domain = '${config.networking.domain}';
-            org_name = '${config.networking.domain}';
-            from_name = 'DMARC Aggregate Report';
-          }
-        '';
-        "dkim_signing.conf".text = ''
-          selector = "quitte2024";
-          allow_username_mismatch = true;
-          allow_hdrfrom_mismatch = true;
-          use_domain_sign_local = "ifsr.de";
-          path = /var/lib/rspamd/dkim/$domain.$selector.key;
-
-        '';
-
-        "multimap.conf".text =
-          let
-            local_ips = pkgs.writeText "localhost.map" ''
-              ::1
-              127.0.0.1
-            '';
-            tud_ips = pkgs.writeText "tud.map" ''
-              141.30.0.0/16
-              141.76.0.0/16
-            '';
-          in
-          ''
-            WHITELIST_SENDER_DOMAIN {
-              type = "from";
-              filter = "email:domain";
-              map = "/var/lib/rspamd/whitelist.sender.domain.map";
-              action = "accept";
-            }
-            WHITELIST_SENDER_EMAIL {
-              type = "from";
-              map = "/var/lib/rspamd/whitelist.sender.email.map";
-              action = "accept";
-            }
-            BLACKLIST_SENDER_DOMAIN {
-              type = "from";
-              filter = "email:domain";
-              map = "/var/lib/rspamd/blacklist.sender.domain.map";
-              action = "reject";
-            }
-            BLACKLIST_SENDER_EMAIL {
-              type = "from";
-              map = "/var/lib/rspamd/blacklist.sender.email.map";
-              action = "reject";
-            }
-            BLACKLIST_SUBJECT_KEYWORDS {
-              type = "header";
-              header = "Subject"
-              map = "/var/lib/rspamd/blacklist.keyword.subject.map";
-              action = "reject";
-              regexp = true;
-            }
-            RECEIVED_LOCALHOST {
-              type = "ip";
-              action = "accept";
-              map = ${local_ips};
-            }
-            RECEIVED_TU_NETWORKS {
-              type = "ip";
-              map = ${tud_ips};
-            }
-
-          '';
-      };
-    };
-    redis = {
-      vmOverCommit = true;
-      servers.rspamd = {
-        enable = true;
-      };
-    };
-    nginx = {
-      enable = true;
-      recommendedGzipSettings = true;
-      recommendedOptimisation = true;
-      recommendedProxySettings = true;
-      recommendedTlsSettings = true;
-
-      virtualHosts."${hostname}" = {
     forceSSL = true;
     enableACME = true;
   };
-      virtualHosts."${rspamd-domain}" = {
+  security.acme.certs."${hostname}" = {
-        forceSSL = true;
-        enableACME = true;
-        locations = {
-          "/" = {
-            proxyPass = "http://127.0.0.1:11334";
-            proxyWebsockets = true;
-          };
-        };
-      };
-    };
-  };
-  security.acme.certs."${domain}" = {
     reloadServices = [
       "postfix.service"
       "dovecot2.service"
     ];
   };
-  systemd = {
-    services.rspamd-dmarc-report = {
-      description = "rspamd dmarc reporter";
-      serviceConfig = {
-        Type = "oneshot";
-        ExecStart = "${pkgs.rspamd}/bin/rspamadm dmarc_report -v";
-        User = "rspamd";
-        Group = "rspamd";
-      };
-      startAt = "daily";
-    };
-  };
 }

modules/mail/dovecot2.nix

@@ -0,0 +1,175 @@
+{ config, pkgs, ... }:
+let
+  hostname = "mail.${config.networking.domain}";
+  dovecot-ldap-args = pkgs.writeText "ldap-args" ''
+    uris = ldap://localhost
+    dn = uid=search, ou=users, dc=ifsr, dc=de
+    auth_bind = yes
+    !include ${config.sops.secrets."dovecot_ldap_search".path}
+
+    ldap_version = 3
+    scope = subtree
+    base = dc=ifsr, dc=de
+    user_filter = (&(objectClass=posixAccount)(uid=%n))
+    pass_filter = (&(objectClass=posixAccount)(uid=%n))
+  '';
+in
+{
+  networking.firewall.allowedTCPPorts = [
+    143 # IMAP
+    993 # IMAPS
+    4190 # Managesieve
+  ];
+  sops.secrets."dovecot_ldap_search".owner = config.services.dovecot2.user;
+  environment.etc = {
+    "dovecot/sieve-pipe/sa-learn-spam.sh" = {
+      text = ''
+        #!/bin/sh
+        ${pkgs.rspamd}/bin/rspamc learn_spam
+      '';
+      mode = "0555";
+    };
+    "dovecot/sieve-pipe/sa-learn-ham.sh" = {
+      text = ''
+        #!/bin/sh
+        ${pkgs.rspamd}/bin/rspamc learn_ham
+      '';
+      mode = "0555";
+    };
+    "dovecot/sieve/report-spam.sieve" = {
+      source = ./report-spam.sieve;
+      user = "dovecot2";
+      group = "dovecot2";
+      mode = "0544";
+    };
+    "dovecot/sieve/report-ham.sieve" = {
+      source = ./report-ham.sieve;
+      user = "dovecot2";
+      group = "dovecot2";
+      mode = "0544";
+    };
+  };
+
+  services.dovecot2 = {
+    enable = true;
+    enableImap = true;
+    enableQuota = true;
+    quotaGlobalPerUser = "10G";
+    enableLmtp = true;
+    enablePAM = false;
+    mailLocation = "maildir:~/Maildir";
+    sslServerCert = "/var/lib/acme/${hostname}/fullchain.pem";
+    sslServerKey = "/var/lib/acme/${hostname}/key.pem";
+    protocols = [ "imap" "sieve" ];
+    mailPlugins = {
+      globally.enable = [ "listescape" ];
+      perProtocol = {
+        imap = {
+          enable = [ "imap_sieve" "imap_filter_sieve" ];
+        };
+        lmtp = {
+          enable = [ "sieve" ];
+        };
+      };
+    };
+    mailboxes = {
+      Spam = {
+        auto = "subscribe";
+        specialUse = "Junk";
+        autoexpunge = "60d";
+      };
+      Sent = {
+        auto = "subscribe";
+        specialUse = "Sent";
+      };
+      Drafts = {
+        auto = "subscribe";
+        specialUse = "Drafts";
+      };
+      Trash = {
+        auto = "subscribe";
+        specialUse = "Trash";
+      };
+      Archive = {
+        auto = "no";
+        specialUse = "Archive";
+      };
+    };
+    modules = [
+      pkgs.dovecot_pigeonhole
+    ];
+    # set to satisfy the sieveScripts check, will be overridden by userdb lookups anyways
+    mailUser = "vmail";
+    mailGroup = "vmail";
+    sieveScripts = {
+      before = pkgs.writeText "spam.sieve" ''
+        require "fileinto";
+
+        if anyof(
+        header :contains "x-spam-flag" "yes",
+        header :contains "X-Spam-Status" "Yes"){
+                fileinto "Spam";
+        }
+      '';
+    };
+    extraConfig = ''
+      auth_username_format = %Ln
+      passdb {
+        driver = ldap
+        args = ${dovecot-ldap-args}
+      }
+      userdb {
+        driver = ldap
+        args = ${dovecot-ldap-args}
+      }
+      service auth {
+        unix_listener /var/lib/postfix/auth {
+          group = postfix
+          mode = 0660
+          user = postfix
+        }
+      }
+      service managesieve-login {
+        inet_listener sieve {
+          port = 4190
+        }
+        service_count = 1
+      }
+
+      namespace inbox {
+        separator = /
+        inbox = yes
+      }
+
+      service lmtp {
+        unix_listener dovecot-lmtp {
+          group = postfix
+          mode = 0600
+          user = postfix
+        }
+        client_limit = 1
+      }
+
+
+      plugin {
+        sieve_plugins = sieve_imapsieve sieve_extprograms
+        sieve_global_extensions = +vnd.dovecot.pipe
+        sieve_pipe_bin_dir = /etc/dovecot/sieve-pipe
+
+        # Spam: From elsewhere to Spam folder or flag changed in Spam folder
+        imapsieve_mailbox1_name = Spam
+        imapsieve_mailbox1_causes = COPY APPEND FLAG
+        imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve
+
+        # Ham: From Spam folder to elsewhere
+        imapsieve_mailbox2_name = *
+        imapsieve_mailbox2_from = Spam
+        imapsieve_mailbox2_causes = COPY
+        imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve
+
+        # https://doc.dovecot.org/configuration_manual/plugins/listescape_plugin/
+        listescape_char = "\\"
+      }
+    '';
+  };
+}

modules/mail/postfix.nix

@@ -0,0 +1,106 @@
+{ config, pkgs, ... }:
+let
+  domain = config.networking.domain;
+  hostname = "mail.${config.networking.domain}";
+  # see https://www.kuketz-blog.de/e-mail-anbieter-ip-stripping-aus-datenschutzgruenden/
+  header_cleanup = pkgs.writeText "header_cleanup_outgoing" ''
+    /^\s*(Received: from)[^\n]*(.*)/ REPLACE $1 127.0.0.1 (localhost [127.0.0.1])$2
+    /^\s*User-Agent/ IGNORE
+    /^\s*X-Enigmail/ IGNORE
+    /^\s*X-Mailer/ IGNORE
+    /^\s*X-Originating-IP/ IGNORE
+    /^\s*Mime-Version/ IGNORE
+  '';
+  # https://unix.stackexchange.com/questions/294300/postfix-prevent-users-from-changing-the-real-e-mail-address
+  login_maps = pkgs.writeText "login_maps.pcre" ''
+    # basic username => username@ifsr.de
+    /^([^@+]*)(\+[^@]*)?@ifsr\.de$/ ''${1}
+  '';
+in
+{
+  sops.secrets."postfix_ldap_aliases".owner = config.services.postfix.user;
+
+  networking.firewall.allowedTCPPorts = [
+    25 # SMTP
+    465 # Submissions
+    587 # Submission
+  ];
+  services = {
+    postfix = {
+      enable = true;
+      enableSubmission = true;
+      enableSubmissions = true;
+      hostname = "${hostname}";
+      domain = "${domain}";
+      origin = "${domain}";
+      destination = [ "${hostname}" "${domain}" "localhost" ];
+      networksStyle = "host"; # localhost and own public IP
+      sslCert = "/var/lib/acme/${hostname}/fullchain.pem";
+      sslKey = "/var/lib/acme/${hostname}/key.pem";
+      relayDomains = [ "hash:/var/lib/mailman/data/postfix_domains" ];
+      config = {
+        home_mailbox = "Maildir/";
+        # 25 MiB
+        message_size_limit = "26214400";
+        # hostname used in helo command. It is recommended to have this match the reverse dns entry
+        smtp_helo_name = config.networking.rDNS;
+        smtpd_banner = "${config.networking.rDNS} ESMTP $mail_name";
+        smtp_use_tls = true;
+        # smtp_tls_security_level = "encrypt";
+        smtpd_use_tls = true;
+        # smtpd_tls_security_level = lib.mkForce "encrypt";
+        # smtpd_tls_auth_only = true;
+        smtpd_tls_protocols = [
+          "!SSLv2"
+          "!SSLv3"
+          "!TLSv1"
+          "!TLSv1.1"
+        ];
+        # "reject_non_fqdn_hostname"
+        smtpd_recipient_restrictions = [
+          "permit_sasl_authenticated"
+          "permit_mynetworks"
+          "reject_unauth_destination"
+          "reject_non_fqdn_sender"
+          "reject_non_fqdn_recipient"
+          "reject_unknown_sender_domain"
+          "reject_unknown_recipient_domain"
+          "reject_unauth_destination"
+          "reject_unauth_pipelining"
+          "reject_invalid_hostname"
+          "check_policy_service inet:localhost:12340"
+        ];
+        smtpd_relay_restrictions = [
+          "permit_sasl_authenticated"
+          "permit_mynetworks"
+          "reject_unauth_destination"
+        ];
+        # https://www.postfix.org/smtp-smuggling.html
+        smtpd_data_restrictions = [
+          "reject_unauth_pipelining"
+        ];
+        smtpd_sender_restrictions = [
+          "reject_authenticated_sender_login_mismatch"
+        ];
+        smtpd_sender_login_maps = [
+          "pcre:/etc/special-aliases.pcre"
+          "pcre:${login_maps}"
+        ];
+        smtp_header_checks = "pcre:${header_cleanup}";
+        # smtpd_sender_login_maps = [ "ldap:${ldap-senders}" ];
+        alias_maps = [ "hash:/etc/aliases" ];
+        alias_database = [ "hash:/etc/aliases" ];
+        # alias_maps = [ "hash:/etc/aliases" "ldap:${ldap-aliases}" ];
+        smtpd_sasl_auth_enable = true;
+        smtpd_sasl_path = "/var/lib/postfix/auth";
+        smtpd_sasl_type = "dovecot";
+        #mailman stuff
+        mailbox_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
+
+        transport_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];
+        virtual_alias_maps = [ "hash:/var/lib/mailman/data/postfix_vmap" ];
+        local_recipient_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" "ldap:${config.sops.secrets."postfix_ldap_aliases".path}" "$alias_maps" ];
+      };
+    };
+  };
+}

modules/mail/rspamd.nix

@@ -0,0 +1,143 @@
+{ config, pkgs, ... }:
+let
+  domain = "rspamd.${config.networking.domain}";
+in
+{
+  sops.secrets."rspamd-password".owner = config.users.users.rspamd.name;
+  users.users.rspamd.extraGroups = [ "redis-rspamd" ];
+  services = {
+    rspamd = {
+      enable = true;
+      postfix.enable = true;
+      locals = {
+        "worker-controller.inc".source = config.sops.secrets."rspamd-password".path;
+        "redis.conf".text = ''
+          read_servers = "/run/redis-rspamd/redis.sock";
+          write_servers = "/run/redis-rspamd/redis.sock";
+        '';
+        # headers in spamassasin style to not break old sieve scripts
+        "worker-proxy.inc".text = ''
+          spam_header = "X-Spam-Flag";
+        '';
+        "milter_headers.conf".text = ''
+          use = ["x-spam-level", "x-spam-status", "x-spamd-result", "authentication-results" ];
+        '';
+        "neural.conf".text = ''
+          servers = "/run/redis-rspamd/redis.sock";
+          enabled = true;
+        '';
+        "neural_group.conf".text = ''
+          symbols = {
+            "NEURAL_SPAM" {
+              weight = 0.5; # fairly low weight since we don't know how this will behave
+              description = "Neural network spam";
+            }
+            "NEURAL_HAM" {
+              weight = -0.5;
+              description = "Neural network ham";
+            }
+          }
+        '';
+        "dmarc.conf".text = ''
+          reporting {
+            enabled = true;
+            email = 'reports@${config.networking.domain}';
+            domain = '${config.networking.domain}';
+            org_name = '${config.networking.domain}';
+            from_name = 'DMARC Aggregate Report';
+          }
+        '';
+        "dkim_signing.conf".text = ''
+          selector = "quitte2024";
+          allow_username_mismatch = true;
+          allow_hdrfrom_mismatch = true;
+          use_domain_sign_local = "ifsr.de";
+          path = /var/lib/rspamd/dkim/$domain.$selector.key;
+
+        '';
+
+        "multimap.conf".text =
+          let
+            local_ips = pkgs.writeText "localhost.map" ''
+              ::1
+              127.0.0.1
+            '';
+            tud_ips = pkgs.writeText "tud.map" ''
+              141.30.0.0/16
+              141.76.0.0/16
+            '';
+          in
+          ''
+            WHITELIST_SENDER_DOMAIN {
+              type = "from";
+              filter = "email:domain";
+              map = "/var/lib/rspamd/whitelist.sender.domain.map";
+              action = "accept";
+            }
+            WHITELIST_SENDER_EMAIL {
+              type = "from";
+              map = "/var/lib/rspamd/whitelist.sender.email.map";
+              action = "accept";
+            }
+            BLACKLIST_SENDER_DOMAIN {
+              type = "from";
+              filter = "email:domain";
+              map = "/var/lib/rspamd/blacklist.sender.domain.map";
+              action = "reject";
+            }
+            BLACKLIST_SENDER_EMAIL {
+              type = "from";
+              map = "/var/lib/rspamd/blacklist.sender.email.map";
+              action = "reject";
+            }
+            BLACKLIST_SUBJECT_KEYWORDS {
+              type = "header";
+              header = "Subject"
+              map = "/var/lib/rspamd/blacklist.keyword.subject.map";
+              action = "reject";
+              regexp = true;
+            }
+            RECEIVED_LOCALHOST {
+              type = "ip";
+              action = "accept";
+              map = ${local_ips};
+            }
+            RECEIVED_TU_NETWORKS {
+              type = "ip";
+              map = ${tud_ips};
+            }
+          '';
+      };
+    };
+    redis = {
+      vmOverCommit = true;
+      servers.rspamd = {
+        enable = true;
+      };
+    };
+    nginx = {
+      virtualHosts."${domain}" = {
+        forceSSL = true;
+        enableACME = true;
+        locations = {
+          "/" = {
+            proxyPass = "http://127.0.0.1:11334";
+            proxyWebsockets = true;
+          };
+        };
+      };
+    };
+  };
+  systemd = {
+    services.rspamd-dmarc-report = {
+      description = "rspamd dmarc reporter";
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = "${pkgs.rspamd}/bin/rspamadm dmarc_report -v";
+        User = "rspamd";
+        Group = "rspamd";
+      };
+      startAt = "daily";
+    };
+  };
+}