diff --git a/eo-redmine-mailfilter.sh b/eo-redmine-mailfilter.sh
index 0aeaf3a..b983cf0 100755
--- a/eo-redmine-mailfilter.sh
+++ b/eo-redmine-mailfilter.sh
@@ -6,6 +6,7 @@ fi
 
 export REDMINE_KEY=`cat /etc/redmine-key`
 export REDMINE_URL='https://dev.entrouvert.org'
+export ATTACHMENTS_BLACKLIST=/etc/redmine.attachments.blacklist.json
 
 export PROJECT=`echo $RECIPIENT | sed 's/support-\([a-z0-9-]*\)@.*/\1/'`
 
diff --git a/mail2redmine.py b/mail2redmine.py
index e2c0096..0374116 100644
--- a/mail2redmine.py
+++ b/mail2redmine.py
@@ -3,6 +3,7 @@
 import os
 import sys
 import email
+import hashlib
 import tempfile
 import uuid
 import smtplib
@@ -18,6 +19,7 @@ TRACKER_ID = os.environ.get('REDMINE_TRACKER', '3')
 PROJECT_ID = os.environ.get('PROJECT')
 TECH_MANAGER_ROLE_ID = os.environ.get('TECH_MANAGER_ROLE_ID', 10)
 FALLBACK_EMAIL = os.environ.get('FALLBACK_EMAIL', 'support@entrouvert.com')
+ATTACHMENTS_BLACKLIST = os.environ.get('ATTACHMENTS_BLACKLIST', None)
 
 
 class UnknownUser(Exception):
@@ -37,7 +39,7 @@ def parse_header(header_text):
         return u' '.join(headers)
 
 
-def parse_attachment(data):
+def parse_attachment(data, blacklist=None):
     if data.get('Content-type', '').startswith('multipart/'):
         return None
     if data.get('Content-type', '').startswith('text/plain') and not (
@@ -46,6 +48,8 @@ def parse_attachment(data):
     file_data = data.get_payload(decode=True)
     if not file_data:
         return None
+    if blacklist and hashlib.sha1(file_data).hexdigest() in blacklist.get('sha1sums'):
+        return None
     with tempfile.NamedTemporaryFile(delete=False) as attachment:
         attachment.write(file_data)
         attachment.flush()
@@ -74,13 +78,20 @@ def create_ticket(mail):
     if not users:
         raise UnknownUser
 
+    blacklist = {'sha1sums': []}
+    if ATTACHMENTS_BLACKLIST:
+        try:
+            blacklist = json.load(open(ATTACHMENTS_BLACKLIST))
+        except (IOError, ValueError):
+            pass
+
     r = Redmine(REDMINE_URL, key=REDMINE_KEY, impersonate=users[0].login)
 
     attachments = []
 
     body = u''
     for data in mail.walk():
-        attachment = parse_attachment(data)
+        attachment = parse_attachment(data, blacklist)
         if attachment:
             attachments.append(attachment)
         elif data.get_content_type() == "text/plain":
diff --git a/test_mail2redmine.py b/test_mail2redmine.py
index 0808d35..61f894e 100644
--- a/test_mail2redmine.py
+++ b/test_mail2redmine.py
@@ -56,6 +56,23 @@ def test_mail_with_two_attachments(message):
             attachments.append(attachment)
     assert len(attachments) == 2
 
+@pytest.mark.parametrize('message', ('mail_dumps/1461591292.25165_17.dor-lomin_2.mail',))
+def test_mail_attachment_blacklist(message):
+    mail = mail2redmine.email.message_from_file(file(message))
+    attachments = []
+    blacklist = {'sha1sums': ['ab7c57983551204500d67f8ec3dd54a01e81d75d']}
+    for data in mail.walk():
+        attachment = mail2redmine.parse_attachment(data, blacklist=blacklist)
+        if attachment:
+            assert 'path' in attachment
+            assert 'content_type' in attachment
+            assert 'filename' in attachment
+            assert isinstance(attachment['filename'], unicode)
+            assert attachment['filename'] == u'201601-mise-a-jour-Publik.pdf'
+            attachments.append(attachment)
+    assert len(attachments) == 1
+
+
 @mock.patch('mail2redmine.Redmine')
 def test_ticket_creation_by_unknown_user(mocked_redmine, dump):
     user = mock.Mock()