diff --git a/app/__init__.py b/app/__init__.py
index 237f53cea..74585a7b2 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -13,7 +13,7 @@ from logging.handlers import SMTPHandler, WatchedFileHandler
 
 from flask import current_app, g, request
 from flask import Flask
-from flask import abort, has_request_context, jsonify
+from flask import abort, flash, has_request_context, jsonify
 from flask import render_template
 from flask.logging import default_handler
 from flask_sqlalchemy import SQLAlchemy
@@ -457,15 +457,12 @@ from app.models import Departement
 from app.scodoc import notesdb as ndb, sco_preferences
 from app.scodoc import sco_cache
 
-# admin_role = Role.query.filter_by(name="SuperAdmin").first()
-# if admin_role:
-#     admin = (
-#         User.query.join(UserRole)
-#         .filter((UserRole.user_id == User.id) & (UserRole.role_id == admin_role.id))
-#         .first()
-#     )
-# else:
-#     click.echo(
-#         "Warning: user database not initialized !\n (use: flask user-db-init)"
-#     )
-#     admin = None
+
+def scodoc_flash_status_messages():
+    """Should be called on each page: flash messages indicating specific ScoDoc status"""
+    email_test_mode_address = sco_preferences.get_preference("email_test_mode_address")
+    if email_test_mode_address:
+        flash(
+            f"Mode test: mails redirigés vers {email_test_mode_address}",
+            category="warning",
+        )
diff --git a/app/comp/bonus_spo.py b/app/comp/bonus_spo.py
index b27219413..2feb05776 100644
--- a/app/comp/bonus_spo.py
+++ b/app/comp/bonus_spo.py
@@ -824,6 +824,27 @@ class BonusRoanne(BonusSportAdditif):
     proportion_point = 1
 
 
+class BonusStBrieuc(BonusSportAdditif):
+    """IUT de Saint Brieuc
+
+    Ne s'applique qu'aux semestres pairs (S2, S4, S6), et bonifie les moyennes d'UE:
+    <ul>
+        <li>Bonus = (S - 10)/20</li>
+    </ul>
+    <div class="warning">(XXX vérifier si S6 est éligible au bonus, et le S2 du DUT XXX)</div>
+    """
+
+    name = "bonus_iut_stbrieuc"
+    displayed_name = "IUT de Saint-Brieuc"
+    proportion_point = 1 / 20.0
+    classic_use_bonus_ues = True
+
+    def compute_bonus(self, sem_modimpl_moys_inscrits, modimpl_coefs_etuds_no_nan):
+        """calcul du bonus"""
+        if self.formsemestre.semestre_id % 2 == 0:
+            super().compute_bonus(sem_modimpl_moys_inscrits, modimpl_coefs_etuds_no_nan)
+
+
 class BonusStDenis(BonusSportAdditif):
     """Calcul bonus modules optionnels (sport, culture), règle IUT Saint-Denis
 
diff --git a/app/email.py b/app/email.py
index 226429df2..1fc7632b6 100644
--- a/app/email.py
+++ b/app/email.py
@@ -1,8 +1,17 @@
 # -*- coding: UTF-8 -*
+##############################################################################
+# ScoDoc
+# Copyright (c) 1999 - 2022 Emmanuel Viennet.  All rights reserved.
+# See LICENSE
+##############################################################################
+
 from threading import Thread
-from flask import current_app
+
+from flask import current_app, g
 from flask_mail import Message
+
 from app import mail
+from app.scodoc import sco_preferences
 
 
 def send_async_email(app, msg):
@@ -11,20 +20,66 @@ def send_async_email(app, msg):
 
 
 def send_email(
-    subject: str, sender: str, recipients: list, text_body: str, html_body=""
+    subject: str,
+    sender: str,
+    recipients: list,
+    text_body: str,
+    html_body="",
+    bcc=(),
+    attachments=(),
 ):
     """
-    Send an email
+    Send an email. _All_ ScoDoc mails SHOULD be sent using this function.
+
     If html_body is specified, build a multipart message with HTML content,
     else send a plain text email.
+
+    attachements: list of dict { 'filename', 'mimetype', 'data' }
     """
-    msg = Message(subject, sender=sender, recipients=recipients)
+    msg = Message(subject, sender=sender, recipients=recipients, bcc=bcc)
     msg.body = text_body
     msg.html = html_body
+    if attachments:
+        for attachment in attachments:
+            msg.attach(
+                attachment["filename"], attachment["mimetype"], attachment["data"]
+            )
+
     send_message(msg)
 
 
-def send_message(msg):
+def send_message(msg: Message):
+    """Send a message.
+    All ScoDoc emails MUST be sent by this function.
+
+    In mail debug mode, addresses are discarded and all mails are sent to the
+    specified debugging address.
+    """
+    if hasattr(g, "scodoc_dept"):
+        # on est dans un département, on peut accéder aux préférences
+        email_test_mode_address = sco_preferences.get_preference(
+            "email_test_mode_address"
+        )
+        if email_test_mode_address:
+            # Mode spécial test: remplace les adresses de destination
+            orig_to = msg.recipients
+            orig_cc = msg.cc
+            orig_bcc = msg.bcc
+            msg.recipients = [email_test_mode_address]
+            msg.cc = None
+            msg.bcc = None
+            msg.subject = "[TEST SCODOC] " + msg.subject
+            msg.body = (
+                f"""--- Message ScoDoc dérouté pour tests ---
+Adresses d'origine:
+ to : {orig_to}
+ cc : {orig_cc}
+ bcc: {orig_bcc}
+--- 
+            \n\n"""
+                + msg.body
+            )
+
     Thread(
         target=send_async_email, args=(current_app._get_current_object(), msg)
     ).start()
diff --git a/app/scodoc/html_sco_header.py b/app/scodoc/html_sco_header.py
index 653cdb80d..8ce3d2cdd 100644
--- a/app/scodoc/html_sco_header.py
+++ b/app/scodoc/html_sco_header.py
@@ -35,7 +35,7 @@ from flask import request
 from flask_login import current_user
 
 import app.scodoc.sco_utils as scu
-from app import log
+from app import scodoc_flash_status_messages
 from app.scodoc import html_sidebar
 import sco_version
 
@@ -153,13 +153,14 @@ def sco_header(
     "Main HTML page header for ScoDoc"
     from app.scodoc.sco_formsemestre_status import formsemestre_page_title
 
+    scodoc_flash_status_messages()
+
     # Get head message from http request:
     if not head_message:
         if request.method == "POST":
             head_message = request.form.get("head_message", "")
         elif request.method == "GET":
             head_message = request.args.get("head_message", "")
-
     params = {
         "page_title": page_title or sco_version.SCONAME,
         "no_side_bar": no_side_bar,
diff --git a/app/scodoc/sco_archives.py b/app/scodoc/sco_archives.py
index 159d3305a..0103caa24 100644
--- a/app/scodoc/sco_archives.py
+++ b/app/scodoc/sco_archives.py
@@ -70,13 +70,13 @@ from app.scodoc.sco_exceptions import (
 )
 from app.scodoc import html_sco_header
 from app.scodoc import sco_bulletins_pdf
-from app.scodoc import sco_excel
 from app.scodoc import sco_formsemestre
 from app.scodoc import sco_groups
 from app.scodoc import sco_groups_view
 from app.scodoc import sco_permissions_check
 from app.scodoc import sco_pvjury
 from app.scodoc import sco_pvpdf
+from app.scodoc.sco_exceptions import ScoValueError
 
 
 class BaseArchiver(object):
@@ -254,7 +254,7 @@ class BaseArchiver(object):
         self.initialize()
         if not scu.is_valid_filename(filename):
             log('Archiver.get: invalid filename "%s"' % filename)
-            raise ValueError("invalid filename")
+            raise ScoValueError("archive introuvable (déjà supprimée ?)")
         fname = os.path.join(archive_id, filename)
         log("reading archive file %s" % fname)
         with open(fname, "rb") as f:
diff --git a/app/scodoc/sco_bulletins.py b/app/scodoc/sco_bulletins.py
index 5f6f91e5b..bb0597e59 100644
--- a/app/scodoc/sco_bulletins.py
+++ b/app/scodoc/sco_bulletins.py
@@ -1040,13 +1040,19 @@ def mail_bulletin(formsemestre_id, I, pdfdata, filename, recipient_addr):
         bcc = copy_addr.strip()
     else:
         bcc = ""
-    msg = Message(subject, sender=sender, recipients=recipients, bcc=[bcc])
-    msg.body = hea
 
     # Attach pdf
-    msg.attach(filename, scu.PDF_MIMETYPE, pdfdata)
     log("mail bulletin a %s" % recipient_addr)
-    email.send_message(msg)
+    email.send_email(
+        subject,
+        sender,
+        recipients,
+        bcc=[bcc],
+        text_body=hea,
+        attachments=[
+            {"filename": filename, "mimetype": scu.PDF_MIMETYPE, "data": pdfdata}
+        ],
+    )
 
 
 def _formsemestre_bulletinetud_header_html(
diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index aab148e70..7476be6b9 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -245,6 +245,7 @@ PREF_CATEGORIES = (
     ),
     ("pe", {"title": "Avis de poursuites d'études"}),
     ("edt", {"title": "Connexion avec le logiciel d'emplois du temps"}),
+    ("debug", {"title": "Tests / mise au point"}),
 )
 
 
@@ -1859,6 +1860,19 @@ class BasePreferences(object):
                     "category": "edt",
                 },
             ),
+            (
+                "email_test_mode_address",
+                {
+                    "title": "Adresse de test",
+                    "initvalue": "",
+                    "explanation": """si cette  adresse est indiquée, TOUS les mails
+                    envoyés par ScoDoc de ce département vont aller vers elle
+                    AU LIEU DE LEUR DESTINATION NORMALE !""",
+                    "size": 30,
+                    "category": "debug",
+                    "only_global": True,
+                },
+            ),
         )
 
         self.prefs_name = set([x[0] for x in self.prefs_definition])
diff --git a/sco_version.py b/sco_version.py
index 55ce771df..4ab7caa51 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.1.71"
+SCOVERSION = "9.1.72"
 
 SCONAME = "ScoDoc"