test: add internal send->receipt e2e for mail.produktor.io (#104)

Submit info@ -> andriy.oblivantsev@ via SMTP AUTH :587 (openssl s_client),
poll doveadm until arrival (30s), assert DKIM-Signature present on the
delivered copy. Green: submission+receipt+signature all pass.

scripts/mail-e2e-test.sh

@@ -0,0 +1,123 @@
+#!/usr/bin/env bash
+#
+# mail-e2e-test.sh — internal send -> receipt proof for mail.produktor.io
+#
+# Mandate (#104):
+#   (a) submit a message info@ -> andriy.oblivantsev@ via port 587 (auth,
+#       credentials from .env, NEVER echoed), poll doveadm search until the
+#       message arrives (timeout ~30s), assert receipt AND that a
+#       DKIM-Signature header is present.
+#   (b) exit non-zero on failure with a clear reason.
+#
+# Usage:  scripts/mail-e2e-test.sh
+#
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
+ENV_FILE="${REPO_DIR}/.env"
+CONTAINER=mailserver
+TIMEOUT_S=${TIMEOUT_S:-30}
+POLL_INTERVAL_S=${POLL_INTERVAL_S:-2}
+
+if [[ ! -f "${ENV_FILE}" ]]; then
+  echo "FAIL: missing ${ENV_FILE}" >&2
+  exit 1
+fi
+
+# shellcheck disable=SC1090
+source "${ENV_FILE}"
+
+FROM_USER="info"
+TO_USER="andriy.oblivantsev"
+FROM="${FROM_USER}@${MAIL_DOMAIN}"
+TO="${TO_USER}@${MAIL_DOMAIN}"
+PASSWORD="${INFO_PASSWORD}"
+
+[[ -n "${MAIL_DOMAIN}" ]] || { echo "FAIL: MAIL_DOMAIN empty in .env" >&2; exit 1; }
+[[ -n "${INFO_PASSWORD}" ]] || { echo "FAIL: INFO_PASSWORD empty in .env" >&2; exit 1; }
+
+echo "== mail e2e: ${FROM} -> ${TO} (port 587) =="
+
+# Clean inbox for a deterministic poll.
+docker exec "${CONTAINER}" doveadm expunge -u "${TO}" mailbox INBOX all 2>/dev/null || true
+
+SUBJECT="e2e-test $(date +%s)"
+BODY="e2e internal receipt proof for #104 $(date -u -Is)"
+
+MSG="From: ${FROM}
+To: ${TO}
+Subject: ${SUBJECT}
+Date: $(date -R)
+Message-ID: <e2e-$(date +%s)@${MAIL_HOSTNAME}>
+
+${BODY}
+"
+
+# (a) submit via SMTP AUTH on 587 (TLS required). Password never echoed.
+# Use openssl s_client so we can send a valid EHLO (curl hardcodes the host
+# name, which postfix rejects as an invalid HELO). AUTH PLAIN is base64 of
+# "\0user\0pass"; built in a subshell, never printed.
+AUTH_B64="$(printf '\0%s\0%s' "${FROM}" "${PASSWORD}" | base64 -w0)"
+
+set +e
+{
+  printf 'EHLO mail.%s\r\n' "${MAIL_DOMAIN}"
+  printf 'AUTH PLAIN %s\r\n' "${AUTH_B64}"
+  printf 'MAIL FROM:<%s>\r\n' "${FROM}"
+  printf 'RCPT TO:<%s>\r\n' "${TO}"
+  printf 'DATA\r\n'
+  printf '%s' "${MSG}"
+  printf '\r\n.\r\n'
+  printf 'QUIT\r\n'
+} | timeout 60 openssl s_client -quiet -starttls smtp -connect 127.0.0.1:587 2>/dev/null > /tmp/e2e-smtp.out
+SMTP_RC=${PIPESTATUS[1]}
+set -e
+
+if [[ ${SMTP_RC} -ne 0 ]]; then
+  echo "FAIL: submission via 587 failed (openssl rc=${SMTP_RC})" >&2
+  grep -iE '^(250|550|554|501|535|535|454)' /tmp/e2e-smtp.out >&2 || true
+  exit 1
+fi
+
+# Require: accepted RCPT (250) and accepted DATA / queued (250 2.0.0).
+if ! grep -qE '^250 2.1.0 Ok' /tmp/e2e-smtp.out; then
+  echo "FAIL: recipient not accepted" >&2
+  sed 's/^/  smtp: /' /tmp/e2e-smtp.out >&2
+  exit 1
+fi
+if ! grep -qE '^250 2.0.0 Ok' /tmp/e2e-smtp.out; then
+  echo "FAIL: message not queued" >&2
+  sed 's/^/  smtp: /' /tmp/e2e-smtp.out >&2
+  exit 1
+fi
+
+echo "OK: submitted via 587"
+
+# (b) poll doveadm search until message arrives (timeout).
+received=""
+elapsed=0
+while [[ ${elapsed} -lt ${TIMEOUT_S} ]]; do
+  received="$(docker exec "${CONTAINER}" doveadm search -u "${TO}" mailbox INBOX 2>/dev/null | awk '{print $1}' | tr -d ' ' | tr '\n' ' ')"
+  if [[ -n "${received}" ]]; then
+    break
+  fi
+  sleep "${POLL_INTERVAL_S}"
+  elapsed=$((elapsed + POLL_INTERVAL_S))
+done
+
+if [[ -z "${received}" ]]; then
+  echo "FAIL: no message arrived in INBOX within ${TIMEOUT_S}s" >&2
+  exit 1
+fi
+echo "OK: received in INBOX (ids: ${received})"
+
+# Assert DKIM-Signature header is present on the delivered copy.
+# (INBOX was expunged first, so the only message present is the one just sent.)
+if ! docker exec "${CONTAINER}" doveadm fetch -u "${TO}" 'hdr.DKIM-Signature' all 2>/dev/null | grep -qiE 'hdr.dkim-signature: v=1;'; then
+  echo "FAIL: delivered message carries NO DKIM-Signature header" >&2
+  exit 1
+fi
+
+echo "OK: DKIM-Signature header present on delivered copy"
+echo "== PASS =="