8 files changed, 405 insertions, 77 deletions

diff --git a/hosts/surtr/email/ccert-policy-server/ccert_policy_server/__main__.py b/hosts/surtr/email/ccert-policy-server/ccert_policy_server/__main__.py
index 00182523..7c931559 100644
--- a/hosts/surtr/email/ccert-policy-server/ccert_policy_server/__main__.py
+++ b/hosts/surtr/email/ccert-policy-server/ccert_policy_server/__main__.py
@@ -28,10 +28,12 @@ class PolicyHandler(StreamRequestHandler):
 
         allowed = False
         user = None
+        relay_eligible = False
         if self.args['sasl_username']:
             user = self.args['sasl_username']
         if self.args['ccert_subject']:
             user = self.args['ccert_subject']
+            relay_eligible = True
 
         if user:
             with self.server.db_pool.connection() as conn:
@@ -44,10 +46,16 @@ class PolicyHandler(StreamRequestHandler):
 
                 with conn.cursor() as cur:
                     cur.row_factory = namedtuple_row
-                    cur.execute('SELECT "mailbox"."mailbox" as "user", "local", "extension", "domain" FROM "mailbox" INNER JOIN "mailbox_mapping" ON "mailbox".id = "mailbox_mapping"."mailbox" WHERE "mailbox"."mailbox" = %(user)s AND ("local" = %(local)s OR "local" IS NULL) AND ("extension" = %(extension)s OR "extension" IS NULL) AND "domain" = %(domain)s', params = {'user': user, 'local': local, 'extension': extension if extension is not None else '', 'domain': domain}, prepare=True)
-                    for record in cur:
-                        logger.debug('Received result: %s', record)
-                        allowed = True
+
+                    if relay_eligible:
+                        cur.execute('SELECT EXISTS(SELECT true FROM "mailbox" INNER JOIN "relay_access" ON "mailbox".id = "relay_access"."mailbox" WHERE "mailbox"."mailbox" = %(user)s AND ("domain" = %(domain)s OR %(domain)s ilike CONCAT(\'%%_.\', "domain"))) as "exists"', params = {'user': user, 'domain': domain})
+                        if (row := cur.fetchone()) is not None:
+                            allowed = row.exists
+
+                    if not allowed:
+                        cur.execute('SELECT EXISTS(SELECT true FROM "mailbox" INNER JOIN "mailbox_mapping" ON "mailbox".id = "mailbox_mapping"."mailbox" WHERE "mailbox"."mailbox" = %(user)s AND ("local" = %(local)s OR "local" IS NULL) AND ("extension" = %(extension)s OR "extension" IS NULL) AND "domain" = %(domain)s) as "exists"', params = {'user': user, 'local': local, 'extension': extension if extension is not None else '', 'domain': domain}, prepare=True)
+                        if (row := cur.fetchone()) is not None:
+                            allowed = row.exists
 
         action = '550 5.7.0 Sender address not authorized for current user'
         if allowed:
diff --git a/hosts/surtr/email/default.nix b/hosts/surtr/email/default.nix
index 845f6455..a3e06ca6 100644
--- a/hosts/surtr/email/default.nix
+++ b/hosts/surtr/email/default.nix
@@ -1,4 +1,4 @@
-{ config, pkgs, lib, flakeInputs, ... }:
+{ config, pkgs, lib, flake, flakeInputs, ... }:
 
 with lib;
 
@@ -15,7 +15,7 @@ let
 
       for file in $out/pipe/bin/*; do
         wrapProgram $file \
-          --set PATH "${pkgs.coreutils}/bin:${pkgs.rspamd}/bin"
+          --set PATH "${makeBinPath (with pkgs; [coreutils rspamd])}"
       done
     '';
   };
@@ -33,12 +33,28 @@ let
         });
       });
     };
+  internal-policy-server =
+    let
+      workspace = flakeInputs.uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./internal-policy-server; };
+      pythonSet = flake.lib.pythonSet {
+        inherit pkgs;
+        python = pkgs.python312;
+        overlay = workspace.mkPyprojectOverlay {
+          sourcePreference = "wheel";
+        };
+      };
+      virtualEnv = pythonSet.mkVirtualEnv "internal-policy-server-env" workspace.deps.default;
+    in virtualEnv.overrideAttrs (oldAttrs: {
+      meta = (oldAttrs.meta or {}) // {
+        mainProgram = "internal-policy-server";
+      };
+    });
 
-  nftables-nologin-script = pkgs.writeScript "nftables-mail-nologin" ''
-    #!${pkgs.zsh}/bin/zsh
-
+  nftables-nologin-script = pkgs.resholve.writeScript "nftables-mail-nologin" {
+    inputs = with pkgs; [inetutils nftables gnugrep findutils];
+    interpreter = lib.getExe pkgs.zsh;
+  } ''
     set -e
-    export PATH="${lib.makeBinPath (with pkgs; [inetutils nftables])}:$PATH"
 
     typeset -a as_sets mnt_bys route route6
     as_sets=(${lib.escapeShellArgs config.services.email.nologin.ASSets})
@@ -51,7 +67,7 @@ let
             elif [[ "''${line}" =~ "^route6:\s+(.+)$" ]]; then
                 route6+=($match[1])
             fi
-        done < <(whois -h whois.radb.net "!i''${as_set},1" | egrep -o 'AS[0-9]+' | xargs -- whois -h whois.radb.net -- -i origin)
+        done < <(whois -h whois.radb.net "!i''${as_set},1" | grep -Eo 'AS[0-9]+' | xargs whois -h whois.radb.net -- -i origin)
     done
     for mnt_by in $mnt_bys; do
         while IFS=$'\n' read line; do
@@ -108,19 +124,20 @@ in {
     services.postfix = {
       enable = true;
       enableSmtp = false;
-      hostname = "surtr.yggdrasil.li";
-      recipientDelimiter = "";
       setSendmail = true;
       postmasterAlias = ""; rootAlias = ""; extraAliases = "";
-      destination = [];
-      sslCert = "/run/credentials/postfix.service/surtr.yggdrasil.li.pem";
-      sslKey = "/run/credentials/postfix.service/surtr.yggdrasil.li.key.pem";
-      networks = [];
-      config = let
-        relay_ccert = "texthash:${pkgs.writeText "relay_ccert" ""}";
-      in {
+      settings.main = {
+        recpipient_delimiter = "";
+        mydestination = [];
+        mynetworks = [];
+        myhostname = "surtr.yggdrasil.li";
+
         smtpd_tls_security_level = "may";
 
+        smtpd_tls_chain_files = [
+          "/run/credentials/postfix.service/surtr.yggdrasil.li.full.pem"
+        ];
+
         #the dh params
         smtpd_tls_dh1024_param_file = toString config.security.dhparams.params."postfix-1024".path;
         smtpd_tls_dh512_param_file = toString config.security.dhparams.params."postfix-512".path;
@@ -155,21 +172,14 @@ in {
 
         smtp_tls_connection_reuse = true;
 
-        tls_server_sni_maps = ''texthash:${pkgs.writeText "sni" (
-          concatMapStringsSep "\n\n" (domain:
-            concatMapStringsSep "\n" (subdomain: "${subdomain} /run/credentials/postfix.service/${removePrefix "." subdomain}.full.pem")
-              [domain "mailin.${domain}" "mailsub.${domain}" ".${domain}"]
-          ) emailDomains
-        )}'';
+        tls_server_sni_maps = "inline:{${concatMapStringsSep ", " (domain: "{ ${domain} = /run/credentials/postfix.service/${removePrefix "." domain}.full.pem }") (concatMap (domain: [domain "mailin.${domain}" "mailsub.${domain}" ".${domain}"]) emailDomains)}}";
 
         smtp_tls_policy_maps = "socketmap:unix:${config.services.postfix-mta-sts-resolver.settings.path}:postfix";
 
         local_recipient_maps = "";
 
-        # 10 GiB
-        message_size_limit = "10737418240";
-        # 10 GiB
-        mailbox_size_limit = "10737418240";
+        message_size_limit = 10 * 1024 * 1024 * 1024;
+        mailbox_size_limit = 10 * 1024 * 1024 * 1024;
 
         smtpd_delay_reject = true;
         smtpd_helo_required = true;
@@ -184,12 +194,12 @@ in {
             dbname = email
             query = SELECT action FROM virtual_mailbox_access WHERE lookup = '%s'
           ''}"
-          "check_ccert_access ${relay_ccert}"
           "reject_non_fqdn_helo_hostname"
           "reject_invalid_helo_hostname"
           "reject_unauth_destination"
           "reject_unknown_recipient_domain"
           "reject_unverified_recipient"
+          "check_policy_service unix:/run/postfix-internal-policy.sock"
         ];
         unverified_recipient_reject_code = "550";
         unverified_recipient_reject_reason = "Recipient address lookup failed";
@@ -204,7 +214,6 @@ in {
         address_verify_sender_ttl = "30045s";
 
         smtpd_relay_restrictions = [
-          "check_ccert_access ${relay_ccert}"
           "reject_unauth_destination"
         ];
 
@@ -251,13 +260,26 @@ in {
         virtual_transport = "dvlmtp:unix:/run/dovecot-lmtp";
         smtputf8_enable = false;
 
-        authorized_submit_users = "inline:{ root= postfwd= }";
+        authorized_submit_users = "inline:{ root= postfwd= ${config.services.dovecot2.user}= }";
+        authorized_flush_users = "inline:{ root= }";
+        authorized_mailq_users = "inline:{ root= }";
 
         postscreen_access_list = "";
         postscreen_denylist_action = "drop";
         postscreen_greet_action = "enforce";
+
+        sender_bcc_maps = ''pgsql:${pkgs.writeText "sender_bcc_maps.cf" ''
+          hosts = postgresql:///email
+          dbname = email
+          query = SELECT value FROM sender_bcc_maps WHERE key = '%s'
+        ''}'';
+        recipient_bcc_maps = ''pgsql:${pkgs.writeText "recipient_bcc_maps.cf" ''
+          hosts = postgresql:///email
+          dbname = email
+          query = SELECT value FROM recipient_bcc_maps WHERE key = '%s'
+        ''}'';
       };
-      masterConfig = {
+      settings.master = {
         "465" = {
           type = "inet";
           private = false;
@@ -280,7 +302,7 @@ in {
             hosts = postgresql:///email
             dbname = email
             query = SELECT action FROM virtual_mailbox_access WHERE lookup = '%s' OR (lookup = regexp_replace('%s', '\+[^@]*@', '@') AND NOT EXISTS (SELECT 1 FROM virtual_mailbox_access WHERE lookup = '%s'))
-          ''},permit_tls_all_clientcerts,reject}''
+          ''},check_policy_service unix:/run/postfix-internal-policy.sock,permit_tls_all_clientcerts,reject}''
             "-o" "smtpd_relay_restrictions=permit_tls_all_clientcerts,reject"
             "-o" "{smtpd_data_restrictions = check_policy_service unix:/run/postfwd3/postfwd3.sock}"
             "-o" "unverified_sender_reject_code=550"
@@ -310,7 +332,7 @@ in {
             hosts = postgresql:///email
             dbname = email
             query = SELECT action FROM virtual_mailbox_access WHERE lookup = '%s' OR (lookup = regexp_replace('%s', '\+[^@]*@', '@') AND NOT EXISTS (SELECT 1 FROM virtual_mailbox_access WHERE lookup = '%s'))
-          ''},permit_sasl_authenticated,reject}''
+          ''},check_policy_service unix:/run/postfix-internal-policy.sock,permit_sasl_authenticated,reject}''
             "-o" "smtpd_relay_restrictions=permit_sasl_authenticated,reject"
             "-o" "{smtpd_data_restrictions = check_policy_service unix:/run/postfwd3/postfwd3.sock}"
             "-o" "unverified_sender_reject_code=550"
@@ -325,7 +347,10 @@ in {
           maxproc = 0;
           args = [
             "-o" "header_checks=pcre:${pkgs.writeText "header_checks_submission" ''
+              if /^Received: /
+              !/by surtr\.yggdrasil\.li/ STRIP
               /^Received: from [^ ]+ \([^ ]+ [^ ]+\)\s+(.*)$/ REPLACE Received: $1
+              endif
             ''}"
           ];
         };
@@ -373,7 +398,7 @@ in {
       enable = true;
       user = "postfix"; group = "postfix";
       socket = "local:/run/opendkim/opendkim.sock";
-      domains = ''csl:${concatStringsSep "," (["surtr.yggdrasil.li"] ++ emailDomains)}'';
+      domains = ''csl:${concatStringsSep "," (["surtr.yggdrasil.li" "yggdrasil.li" "141.li" "kleen.li" "synapse.li" "praseodym.org"] ++ emailDomains)}'';
       selector = "surtr";
       configFile = builtins.toFile "opendkim.conf" ''
         Syslog true
@@ -477,7 +502,7 @@ in {
       };
     };
 
-    users.groups.${config.services.rspamd.group}.members = [ config.services.postfix.user "dovecot2" ];
+    users.groups.${config.services.rspamd.group}.members = [ config.services.postfix.user config.services.dovecot2.user ];
 
     services.redis.servers.rspamd.enable = true;
 
@@ -487,22 +512,22 @@ in {
     services.dovecot2 = {
       enable = true;
       enablePAM = false;
-      sslServerCert = "/run/credentials/dovecot2.service/surtr.yggdrasil.li.pem";
-      sslServerKey = "/run/credentials/dovecot2.service/surtr.yggdrasil.li.key.pem";
+      sslServerCert = "/run/credentials/dovecot.service/surtr.yggdrasil.li.pem";
+      sslServerKey = "/run/credentials/dovecot.service/surtr.yggdrasil.li.key.pem";
       sslCACert = toString ./ca/ca.crt;
       mailLocation = "maildir:/var/lib/mail/%u/maildir:UTF-8:INDEX=/var/lib/dovecot/indices/%u";
       mailPlugins.globally.enable = [ "fts" "fts_xapian" ];
       protocols = [ "lmtp" "sieve" ];
       sieve = {
-        extensions = ["copy" "imapsieve" "variables" "imap4flags" "vacation"];
-        globalExtensions = ["copy" "imapsieve" "variables" "imap4flags" "vacation"];
+        extensions = ["copy" "imapsieve" "variables" "imap4flags" "vacation" "vacation-seconds" "vnd.dovecot.debug"];
+        globalExtensions = ["copy" "imapsieve" "variables" "imap4flags" "vacation" "vacation-seconds" "vnd.dovecot.debug"];
       };
       extraConfig = let
         dovecotSqlConf = pkgs.writeText "dovecot-sql.conf" ''
           driver = pgsql
           connect = dbname=email
-          password_query = SELECT (CASE WHEN '%k' = 'valid' AND '%m' = 'EXTERNAL' THEN NULL ELSE "password" END) as password, (CASE WHEN '%k' = 'valid' AND '%m' = 'EXTERNAL' THEN true WHEN password IS NULL THEN true ELSE NULL END) as nopassword, "user", quota_rule, 'dovecot2' as uid, 'dovecot2' as gid FROM imap_user WHERE "user" = '%n'
-          user_query = SELECT "user", quota_rule, 'dovecot2' as uid, 'dovecot2' as gid FROM imap_user WHERE "user" = '%n'
+          password_query = SELECT (CASE WHEN '%k' = 'valid' AND '%m' = 'EXTERNAL' THEN NULL ELSE "password" END) as password, (CASE WHEN '%k' = 'valid' AND '%m' = 'EXTERNAL' THEN true WHEN password IS NULL THEN true ELSE NULL END) as nopassword, "user", quota_rule, '${config.services.dovecot2.user}' as uid, '${config.services.dovecot2.group}' as gid FROM imap_user WHERE "user" = '%n'
+          user_query = SELECT "user", quota_rule, '${config.services.dovecot2.user}' as uid, 'dovecot2' as gid FROM imap_user WHERE "user" = '%n'
           iterate_query = SELECT "user" FROM imap_user
         '';
       in ''
@@ -510,16 +535,16 @@ in {
 
         mail_plugins = $mail_plugins quota
 
-        first_valid_uid = ${toString config.users.users.dovecot2.uid}
-        last_valid_uid = ${toString config.users.users.dovecot2.uid}
-        first_valid_gid = ${toString config.users.groups.dovecot2.gid}
-        last_valid_gid = ${toString config.users.groups.dovecot2.gid}
+        first_valid_uid = ${toString config.users.users.${config.services.dovecot2.user}.uid}
+        last_valid_uid = ${toString config.users.users.${config.services.dovecot2.user}.uid}
+        first_valid_gid = ${toString config.users.groups.${config.services.dovecot2.group}.gid}
+        last_valid_gid = ${toString config.users.groups.${config.services.dovecot2.group}.gid}
 
         ${concatMapStringsSep "\n\n" (domain:
           concatMapStringsSep "\n" (subdomain: ''
             local_name ${subdomain} {
-              ssl_cert = </run/credentials/dovecot2.service/${subdomain}.pem
-              ssl_key = </run/credentials/dovecot2.service/${subdomain}.key.pem
+              ssl_cert = </run/credentials/dovecot.service/${subdomain}.pem
+              ssl_key = </run/credentials/dovecot.service/${subdomain}.key.pem
             }
           '') ["imap.${domain}" domain]
         ) emailDomains}
@@ -540,10 +565,10 @@ in {
         auth_debug = yes
 
         service auth {
-          user = dovecot2
+          user = ${config.services.dovecot2.user}
         }
         service auth-worker {
-          user = dovecot2
+          user = ${config.services.dovecot2.user}
         }
 
         userdb {
@@ -564,7 +589,7 @@ in {
             args = ${pkgs.writeText "dovecot-sql.conf" ''
               driver = pgsql
               connect = dbname=email
-              user_query = SELECT DISTINCT ON (extension IS NULL, local IS NULL) "user", quota_rule, 'dovecot2' as uid, 'dovecot2' as gid FROM lmtp_mapping WHERE CASE WHEN extension IS NOT NULL AND local IS NOT NULL THEN ('%n' :: citext) = local || '+' || extension AND domain = ('%d' :: citext) WHEN local IS NOT NULL THEN (local = ('%n' :: citext) OR ('%n' :: citext) ILIKE local || '+%%') AND domain = ('%d' :: citext) WHEN extension IS NOT NULL THEN ('%n' :: citext) ILIKE '%%+' || extension AND domain = ('%d' :: citext) ELSE domain = ('%d' :: citext) END ORDER BY (extension IS NULL) ASC, (local IS NULL) ASC
+              user_query = SELECT DISTINCT ON (extension IS NULL, local IS NULL) "user", quota_rule, '${config.services.dovecot2.user}' as uid, '${config.services.dovecot2.group}' as gid FROM lmtp_mapping WHERE CASE WHEN extension IS NOT NULL AND local IS NOT NULL THEN ('%n' :: citext) = local || '+' || extension AND domain = ('%d' :: citext) WHEN local IS NOT NULL THEN (local = ('%n' :: citext) OR ('%n' :: citext) ILIKE local || '+%%') AND domain = ('%d' :: citext) WHEN extension IS NOT NULL THEN ('%n' :: citext) ILIKE '%%+' || extension AND domain = ('%d' :: citext) ELSE domain = ('%d' :: citext) END ORDER BY (extension IS NULL) ASC, (local IS NULL) ASC
             ''}
 
             skip = never
@@ -634,7 +659,7 @@ in {
           quota_status_success = DUNNO
           quota_status_nouser = DUNNO
           quota_grace = 10%%
-          quota_max_mail_size = ${config.services.postfix.config.message_size_limit}
+          quota_max_mail_size = ${toString config.services.postfix.settings.main.message_size_limit}
           quota_vsizes = yes
         }
 
@@ -672,7 +697,7 @@ in {
         plugin {
           plugin = fts fts_xapian
           fts = xapian
-          fts_xapian = partial=2 full=20 attachments=1 verbose=1
+          fts_xapian = partial=3 full=20 attachments=1 verbose=1
 
           fts_autoindex = yes
 
@@ -687,12 +712,12 @@ in {
 
     systemd.services.dovecot-fts-xapian-optimize = {
       description = "Optimize dovecot indices for fts_xapian";
-      requisite = [ "dovecot2.service" ];
-      after = [ "dovecot2.service" ];
+      requisite = [ "dovecot.service" ];
+      after = [ "dovecot.service" ];
       startAt = "*-*-* 22:00:00 Europe/Berlin";
       serviceConfig = {
         Type = "oneshot";
-        ExecStart = "${pkgs.dovecot}/bin/doveadm fts optimize -A";
+        ExecStart = "${getExe' pkgs.dovecot "doveadm"} fts optimize -A";
         PrivateDevices = true;
         PrivateNetwork = true;
         ProtectKernelTunables = true;
@@ -753,31 +778,29 @@ in {
 
     security.acme.rfc2136Domains = {
       "surtr.yggdrasil.li" = {
-        restartUnits = [ "postfix.service" "dovecot2.service" ];
+        restartUnits = [ "postfix.service" "dovecot.service" ];
       };
     } // listToAttrs (map (domain: nameValuePair "spm.${domain}" { restartUnits = ["nginx.service"]; }) spmDomains)
     // listToAttrs (concatMap (domain: [
-      (nameValuePair domain { restartUnits = ["postfix.service" "dovecot2.service"]; })
+      (nameValuePair domain { restartUnits = ["postfix.service" "dovecot.service"]; })
       (nameValuePair "mailin.${domain}" { restartUnits = ["postfix.service"]; })
       (nameValuePair "mailsub.${domain}" { restartUnits = ["postfix.service"]; })
-      (nameValuePair "imap.${domain}" { restartUnits = ["dovecot2.service"]; })
+      (nameValuePair "imap.${domain}" { restartUnits = ["dovecot.service"]; })
       (nameValuePair "mta-sts.${domain}" { restartUnits = ["nginx.service"]; })
     ]) emailDomains);
 
     systemd.services.postfix = {
-      serviceConfig.LoadCredential = [
-        "surtr.yggdrasil.li.key.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/key.pem"
-        "surtr.yggdrasil.li.pem:${config.security.acme.certs."surtr.yggdrasil.li".directory}/fullchain.pem"
-      ] ++ concatMap (domain:
-        map (subdomain: "${subdomain}.full.pem:${config.security.acme.certs.${subdomain}.directory}/full.pem")
-          [domain "mailin.${domain}" "mailsub.${domain}"]
-      ) emailDomains;
+      serviceConfig.LoadCredential = let
+        tlsCredential = domain: "${domain}.full.pem:${config.security.acme.certs.${domain}.directory}/full.pem";
+      in [
+        (tlsCredential "surtr.yggdrasil.li")
+      ] ++ concatMap (domain: map tlsCredential [domain "mailin.${domain}" "mailsub.${domain}"]) emailDomains;
     };
 
-    systemd.services.dovecot2 = {
+    systemd.services.dovecot = {
       preStart = ''
         for f in /etc/dovecot/sieve_flag.d/*.sieve /etc/dovecot/sieve_before.d/*.sieve; do
-          ${pkgs.dovecot_pigeonhole}/bin/sievec $f
+          ${getExe' pkgs.dovecot_pigeonhole "sievec"} $f
         done
       '';
 
@@ -844,15 +867,16 @@ in {
               charset utf-8;
               source_charset utf-8;
             '';
-            root = pkgs.runCommand "mta-sts.${domain}" {} ''
-              mkdir -p $out/.well-known
-              cp ${pkgs.writeText "mta-sts.${domain}.txt" ''
+            root = pkgs.writeTextFile {
+              name = "mta-sts.${domain}";
+              destination = "/.well-known/mta-sts.txt";
+              text = ''
                 version: STSv1
                 mode: enforce
                 max_age: 2419200
                 mx: mailin.${domain}
-              ''} $out/.well-known/mta-sts.txt
-            '';
+              '';
+            };
           };
       }) emailDomains);
     };
@@ -869,7 +893,7 @@ in {
     systemd.services.spm = {
       serviceConfig = {
         Type = "notify";
-        ExecStart = "${pkgs.spm}/bin/spm-server";
+        ExecStart = getExe' pkgs.spm "spm-server";
         User = "spm";
         Group = "spm";
 
@@ -927,7 +951,7 @@ in {
       serviceConfig = {
         Type = "notify";
 
-        ExecStart = "${ccert-policy-server}/bin/ccert-policy-server";
+        ExecStart = getExe' ccert-policy-server "ccert-policy-server";
 
         Environment = [
           "PGDATABASE=email"
@@ -960,6 +984,53 @@ in {
     };
     users.groups."postfix-ccert-sender-policy" = {};
 
+    systemd.sockets."postfix-internal-policy" = {
+      requiredBy = ["postfix.service"];
+      wants = ["postfix-internal-policy.service"];
+      socketConfig = {
+        ListenStream = "/run/postfix-internal-policy.sock";
+      };
+    };
+    systemd.services."postfix-internal-policy" = {
+      after = [ "postgresql.service" ];
+      bindsTo = [ "postgresql.service" ];
+
+      serviceConfig = {
+        Type = "notify";
+
+        ExecStart = lib.getExe internal-policy-server;
+
+        Environment = [
+          "PGDATABASE=email"
+        ];
+
+        DynamicUser = false;
+        User = "postfix-internal-policy";
+        Group = "postfix-internal-policy";
+        ProtectSystem = "strict";
+        SystemCallFilter = "@system-service";
+        NoNewPrivileges = true;
+        ProtectKernelTunables = true;
+        ProtectKernelModules = true;
+        ProtectKernelLogs = true;
+        ProtectControlGroups = true;
+        MemoryDenyWriteExecute = true;
+        RestrictSUIDSGID = true;
+        KeyringMode = "private";
+        ProtectClock = true;
+        RestrictRealtime = true;
+        PrivateDevices = true;
+        PrivateTmp = true;
+        ProtectHostname = true;
+        ReadWritePaths = ["/run/postgresql"];
+      };
+    };
+    users.users."postfix-internal-policy" = {
+      isSystemUser = true;
+      group = "postfix-internal-policy";
+    };
+    users.groups."postfix-internal-policy" = {};
+
     services.postfwd = {
       enable = true;
       cache = false;
diff --git a/hosts/surtr/email/internal-policy-server/.envrc b/hosts/surtr/email/internal-policy-server/.envrc
new file mode 100644
index 00000000..2c909235
--- /dev/null
+++ b/hosts/surtr/email/internal-policy-server/.envrc
@@ -0,0 +1,4 @@
+use flake
+
+[[ -d ".venv" ]] || ( uv venv && uv sync )
+. .venv/bin/activate
diff --git a/hosts/surtr/email/internal-policy-server/.gitignore b/hosts/surtr/email/internal-policy-server/.gitignore
new file mode 100644
index 00000000..4ccfae70
--- /dev/null
+++ b/hosts/surtr/email/internal-policy-server/.gitignore
@@ -0,0 +1,2 @@
+.venv
+**/__pycache__
diff --git a/hosts/surtr/email/internal-policy-server/internal_policy_server/__init__.py b/hosts/surtr/email/internal-policy-server/internal_policy_server/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/hosts/surtr/email/internal-policy-server/internal_policy_server/__init__.py
diff --git a/hosts/surtr/email/internal-policy-server/internal_policy_server/__main__.py b/hosts/surtr/email/internal-policy-server/internal_policy_server/__main__.py
new file mode 100644
index 00000000..04f1a59a
--- /dev/null
+++ b/hosts/surtr/email/internal-policy-server/internal_policy_server/__main__.py
@@ -0,0 +1,106 @@
+from systemd.daemon import listen_fds
+from sdnotify import SystemdNotifier
+from socketserver import StreamRequestHandler, ThreadingMixIn
+from systemd_socketserver import SystemdSocketServer
+import sys
+from threading import Thread
+from psycopg_pool import ConnectionPool
+from psycopg.rows import namedtuple_row
+
+import logging
+
+
+class PolicyHandler(StreamRequestHandler):
+    def handle(self):
+        logger.debug('Handling new connection...')
+
+        self.args = dict()
+
+        line = None
+        while line := self.rfile.readline().removesuffix(b'\n'):
+            if b'=' not in line:
+                break
+
+            key, val = line.split(sep=b'=', maxsplit=1)
+            self.args[key.decode()] = val.decode()
+
+        logger.info('Connection parameters: %s', self.args)
+
+        allowed = False
+        user = None
+        if self.args['sasl_username']:
+            user = self.args['sasl_username']
+        if self.args['ccert_subject']:
+            user = self.args['ccert_subject']
+
+        with self.server.db_pool.connection() as conn:
+            local, domain = self.args['recipient'].split(sep='@', maxsplit=1)
+            extension = None
+            if '+' in local:
+                local, extension = local.split(sep='+', maxsplit=1)
+
+            logger.debug('Parsed recipient address: %s', {'local': local, 'extension': extension, 'domain': domain})
+
+            with conn.cursor() as cur:
+                cur.row_factory = namedtuple_row
+                cur.execute('SELECT id, internal FROM "mailbox_mapping" WHERE ("local" = %(local)s OR "local" IS NULL) AND ("extension" = %(extension)s OR "extension" IS NULL) AND "domain" = %(domain)s', params = {'local': local, 'extension': extension if extension is not None else '', 'domain': domain}, prepare = True)
+                if (row := cur.fetchone()) is not None:
+                    if not row.internal:
+                        logger.debug('Recipient mailbox is not internal')
+                        allowed = True
+                    elif user:
+                        cur.execute('SELECT EXISTS(SELECT true FROM "mailbox_mapping_access" INNER JOIN "mailbox" ON "mailbox".id = "mailbox_mapping_access"."mailbox" WHERE mailbox_mapping = %(mailbox_mapping)s AND "mailbox"."mailbox" = %(user)s) as "exists"', params = { 'mailbox_mapping': row.id, 'user': user }, prepare = True)
+                        if (row := cur.fetchone()) is not None:
+                            allowed = row.exists
+                else:
+                    logger.debug('Recipient is not local')
+                    allowed = True
+
+        action = '550 5.7.0 Recipient mailbox mapping not authorized for current user'
+        if allowed:
+            action = 'DUNNO'
+
+        logger.info('Reached verdict: %s', {'allowed': allowed, 'action': action})
+        self.wfile.write(f'action={action}\n\n'.encode())
+
+class ThreadedSystemdSocketServer(ThreadingMixIn, SystemdSocketServer):
+    def __init__(self, fd, RequestHandlerClass):
+        super().__init__(fd, RequestHandlerClass)
+
+        self.db_pool = ConnectionPool(min_size=1)
+        self.db_pool.wait()
+
+def main():
+    global logger
+    logger = logging.getLogger(__name__)
+    console_handler = logging.StreamHandler()
+    console_handler.setFormatter( logging.Formatter('[%(levelname)s](%(name)s): %(message)s') )
+    if sys.stderr.isatty():
+        console_handler.setFormatter( logging.Formatter('%(asctime)s [%(levelname)s](%(name)s): %(message)s') )
+    logger.addHandler(console_handler)
+    logger.setLevel(logging.DEBUG)
+
+    # log uncaught exceptions
+    def log_exceptions(type, value, tb):
+        global logger
+
+        logger.error(value)
+        sys.__excepthook__(type, value, tb) # calls default excepthook
+
+    sys.excepthook = log_exceptions
+
+    fds = listen_fds()
+    servers = [ThreadedSystemdSocketServer(fd, PolicyHandler) for fd in fds]
+
+    if servers:
+        for server in servers:
+            Thread(name=f'Server for fd{server.fileno()}', target=server.serve_forever).start()
+    else:
+        return 2
+
+    SystemdNotifier().notify('READY=1')
+
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())
diff --git a/hosts/surtr/email/internal-policy-server/pyproject.toml b/hosts/surtr/email/internal-policy-server/pyproject.toml
new file mode 100644
index 00000000..c697cd01
--- /dev/null
+++ b/hosts/surtr/email/internal-policy-server/pyproject.toml
@@ -0,0 +1,18 @@
+[project]
+name = "internal-policy-server"
+version = "0.1.0"
+requires-python = ">=3.12"
+dependencies = [
+    "psycopg>=3.2.9",
+    "psycopg-binary>=3.2.9",
+    "psycopg-pool>=3.2.6",
+    "sdnotify>=0.3.2",
+    "systemd-socketserver>=1.0",
+]
+
+[project.scripts]
+internal-policy-server = "internal_policy_server.__main__:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
diff --git a/hosts/surtr/email/internal-policy-server/uv.lock b/hosts/surtr/email/internal-policy-server/uv.lock
new file mode 100644
index 00000000..f7a4e729
--- /dev/null
+++ b/hosts/surtr/email/internal-policy-server/uv.lock
@@ -0,0 +1,119 @@
+version = 1
+revision = 2
+requires-python = ">=3.12"
+
+[[package]]
+name = "internal-policy-server"
+version = "0.1.0"
+source = { editable = "." }
+dependencies = [
+    { name = "psycopg" },
+    { name = "psycopg-binary" },
+    { name = "psycopg-pool" },
+    { name = "sdnotify" },
+    { name = "systemd-socketserver" },
+]
+
+[package.metadata]
+requires-dist = [
+    { name = "psycopg", specifier = ">=3.2.9" },
+    { name = "psycopg-binary", specifier = ">=3.2.9" },
+    { name = "psycopg-pool", specifier = ">=3.2.6" },
+    { name = "sdnotify", specifier = ">=0.3.2" },
+    { name = "systemd-socketserver", specifier = ">=1.0" },
+]
+
+[[package]]
+name = "psycopg"
+version = "3.2.9"
+source = { registry = "https://pypi.org/simple" }
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+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
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+]
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