introduce MESSAGE_RATELIMIT_EXEMPTION

core/admin/mailu/configuration.py

@@ -54,6 +54,7 @@ DEFAULT_CONFIG = {
     'DKIM_PATH': '/dkim/{domain}.{selector}.key',
     'DEFAULT_QUOTA': 1000000000,
     'MESSAGE_RATELIMIT': '200/day',
+    'MESSAGE_RATELIMIT_EXEMPTION': '',
     'RECIPIENT_DELIMITER': '',
     # Web settings
     'SITENAME': 'Mailu',

core/admin/mailu/internal/views/postfix.py

@@ -149,6 +149,8 @@ def postfix_sender_login(sender):
 def postfix_sender_rate(sender):
     """ Rate limit outbound emails per sender login
     """
+    if sender in [s for s in flask.current_app.config.get('MESSAGE_RATELIMIT_EXEMPTION', '').lower().replace(' ', '').split(',') if s]:
+        flask.abort(404)
     user = models.User.get(sender) or flask.abort(404)
     return flask.abort(404) if user.sender_limiter.hit() else flask.jsonify("450 4.2.1 You are sending too many emails too fast.")
 

docs/configuration.rst

@@ -69,9 +69,11 @@ The ``MESSAGE_SIZE_LIMIT`` is the maximum size of a single email. It should not
 be too low to avoid dropping legitimate emails and should not be too high to
 avoid filling the disks with large junk emails.
 
-The ``MESSAGE_RATELIMIT`` is the limit of messages a single user can send. This is
+The ``MESSAGE_RATELIMIT`` (default: 200/day) is the maximum number of messages
-meant to fight outbound spam in case of compromised or malicious account on the
+a single user can send. ``MESSAGE_RATELIMIT_EXEMPTION`` contains a comma delimited
-server.
+list of user email addresses that are exempted from any restriction.  Those
+settings are meant to reduce outbound spam in case of compromised or malicious
+account on the server.
 
 The ``RELAYNETS`` (default: unset) is a comma delimited list of network addresses
 for which mail is relayed for with no authentication required. This should be