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/milter/inbound.go

@@ -34,7 +34,7 @@ type InboundStore interface {
 // Postfix attaches the socket with default_action=accept, so
 // neither an error here nor the panel being down holds up inbound mail.
 //
-// Postfix 3.7.11, src/milter/milter.c, milter_message(): the milters are asked
+// Postfix 3.10.13, src/milter/milter.c, milter_message(): the milters are asked
 // in turn while the reply is null, so one that refuses is the last asked;
 // src/milter/milter8.c, milter8_comm_error(): default_action=accept gives no
 // reply when this milter cannot answer.
@@ -91,7 +91,7 @@ func (s *inboundSession) RcptTo(rcpt string, m *milter.Modifier) (milter.Respons
 // the last one read is its own - when it is up. Whether it was is decided at
 // end-of-message, by the signature.
 //
-// Postfix 3.7.11, src/milter/milter.c, milter_message(), hands each milter the
+// Postfix 3.10.13, src/milter/milter.c, milter_message(), hands each milter the
 // queue file from the start of the content; src/milter/milter8.c,
 // milter8_message(), reads it with rec_get(), which follows the pointer
 // records src/cleanup/cleanup_milter.c, cleanup_add_header(), leaves after
@@ -151,7 +151,7 @@ func (s *inboundSession) signed(queueID string) bool {
 // upstream. "Continue" lets it through as "accept" would, and keeps this
 // session for the connection's next message.
 //
-// The queue id: Postfix 3.7.11, src/global/mail_params.h, DEF_MILT_EOD_MACROS
+// The queue id: Postfix 3.10.13, src/global/mail_params.h, DEF_MILT_EOD_MACROS
 // "i", answered by src/cleanup/cleanup_milter.c, cleanup_milter_eval(). The
 // rest as session.Body in milter.go.
 func (s *inboundSession) Body(m *milter.Modifier) (milter.Response, error) {