base-trixie: the image on Debian trixie, Postfix 3.10.13; Received: hidden on 465/587

The runtime base is debian:trixie-slim, the build stage golang:1.26-trixie:
Postfix 3.10.13 with upstream's 2026 security fixes up to the August
batch, libmilter 8.18.1, OpenSSL 3.5. Every citation of another program in
code, scripts and documents was re-read against the trixie sources
(dev/upstream; bookworm's kept in dev/upstream-bookworm) and updated;
development.md's cited-package table holds the trixie versions.

What the re-reading changed in behaviour:
- logtail: reject lines with sasl_method/sasl_username/sasl_sender
  (smtpd_check.c:1019-1026); cleanup's "removed (canceled)" forgets a
  port-25 id (cleanup_api.c:363-364).
- internal/postfix/retry.go reads postconf's stdout only: since 3.9 a
  deprecated-parameter warning on stderr made one value too many and the
  panel fell back to the compiled-in retry policy.
- logrotate-loop.sh: logrotate 3.22 exits 1 when it ignores a config;
  the loop refuses on that output whatever the status.
- postfix-config.sh: cyrus_sasl_config_path set explicitly (bookworm's
  07_sasl_config.diff is gone); maillog_file_permissions=0640; mynetworks
  explicit; Dockerfile: SYNC_CHROOT= in /etc/default/postfix,
  opendkim-tools dropped, openssl named, systemd-standalone-sysusers so
  cron does not bring the whole of systemd.
- The selfpost group is 10998, outside the system range 100-999: in
  trixie a package took 998 and the build failed (owner's decision:
  a conflict-free id, the distribution's own ids untouched). The
  entrypoint hands /data back by name when the user or the group differs.
  Guide, backup refusal text, help (design commit 68ec8b2), e2e.
- smtpd_hide_client_session=yes on smtps and submission (owner's
  decision): Received: names no client, TLS, login or protocol; port 25
  keeps the full header. e2e checks both.
- test/upstream/opendkim-probe.sh makes keys with openssl genrsa.

Tests: on the server, make e2e exit 0 (674 s, the image built on trixie),
go vet + go test 27 packages ok. CHANGELOG [Unreleased], guide,
architecture.md, security.md, roadmap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/postfix/queue.go

@@ -51,7 +51,7 @@ var postqueueP = func(ctx context.Context) *exec.Cmd {
 // listQueue runs `postqueue -p` and keeps at most maxQueueOutput bytes of it;
 // truncated says whether there was more.
 //
-// Postfix 3.7.11, src/postqueue/postqueue.c, show_queue(): any user passes
+// Postfix 3.10.13, src/postqueue/postqueue.c, show_queue(): any user passes
 // authorized_mailq_users (DEF_SHOWQ_ACL static:anyone), and a failure is
 // msg_fatal_status() - a non-zero exit with the reason on stderr;
 // src/postqueue/showq_compat.c, showq_compat(): "Mail queue is empty".
@@ -107,7 +107,7 @@ func Queue() (string, error) {
 // cut are still in the queue, and a backlog that large is the outage the sweep
 // exists for (audit 2026-10-12, H3). QueueMessages treats its cap the same way.
 //
-// Postfix 3.7.11, src/showq/showq.c, showq_service(): maildrop, active,
+// Postfix 3.10.13, src/showq/showq.c, showq_service(): maildrop, active,
 // incoming, deferred and hold are the queues it lists.
 func QueueIDs() (map[string]struct{}, error) {
 	out, truncated, err := listQueue()
@@ -126,7 +126,7 @@ func QueueIDs() (map[string]struct{}, error) {
 //
 // The id is at the start of the line, optionally flagged '*' (in the active
 // queue) or '!' (on hold), then '#' when the message was forced to expire
-// (Postfix 3.7.11, src/postqueue/showq_compat.c, showq_message(): the flags
+// (Postfix 3.10.13, src/postqueue/showq_compat.c, showq_message(): the flags
 // are appended to the id in that order; assumptions B-PQ1), and is followed
 // by the message size. Requiring the
 // size is what separates an entry from the listing's other left-margin lines: