diff --git a/core/admin/mailu/configuration.py b/core/admin/mailu/configuration.py
index 4401888a..1f2a9239 100644
--- a/core/admin/mailu/configuration.py
+++ b/core/admin/mailu/configuration.py
@@ -49,6 +49,7 @@ DEFAULT_CONFIG = {
     'DKIM_PATH': '/dkim/{domain}.{selector}.key',
     'DEFAULT_QUOTA': 1000000000,
     'MESSAGE_RATELIMIT': '200/day',
+    'RECIPIENT_DELIMITER': '',
     # Web settings
     'SITENAME': 'Mailu',
     'WEBSITE': 'https://mailu.io',
diff --git a/core/admin/mailu/internal/views/postfix.py b/core/admin/mailu/internal/views/postfix.py
index 928f4faf..ab965967 100644
--- a/core/admin/mailu/internal/views/postfix.py
+++ b/core/admin/mailu/internal/views/postfix.py
@@ -140,6 +140,7 @@ def postfix_sender_login(sender):
     localpart, domain_name = models.Email.resolve_domain(sender)
     if localpart is None:
         return flask.jsonify(",".join(wildcard_senders)) if wildcard_senders else flask.abort(404)
+    localpart = localpart[:next((i for i, ch in enumerate(localpart) if ch in flask.current_app.config.get('RECIPIENT_DELIMITER')), None)]
     destination = models.Email.resolve_destination(localpart, domain_name, True)
     destination = [*destination, *wildcard_senders] if destination else [*wildcard_senders]
     return flask.jsonify(",".join(destination)) if destination else flask.abort(404)
diff --git a/docs/configuration.rst b/docs/configuration.rst
index 5f17b57e..5d8e87b1 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -93,9 +93,10 @@ go and fetch new email if available. Do not use too short delays if you do not
 want to be blacklisted by external services, but not too long delays if you
 want to receive your email in time.
 
-The ``RECIPIENT_DELIMITER`` is a character used to delimit localpart from a
-custom address part. For instance, if set to ``+``, users can use addresses
-like ``localpart+custom@domain.tld`` to deliver mail to ``localpart@domain.tld``.
+The ``RECIPIENT_DELIMITER`` is a list of characters used to delimit localpart
+from a custom address part. For instance, if set to ``+-``, users can use
+addresses like ``localpart+custom@example.com`` or ``localpart-custom@example.com``
+to deliver mail to ``localpart@example.com``.
 This is useful to provide external parties with different email addresses and
 later classify incoming mail based on the custom part.
 
diff --git a/towncrier/newsfragments/2007.enhancement b/towncrier/newsfragments/2007.enhancement
new file mode 100644
index 00000000..802e6d36
--- /dev/null
+++ b/towncrier/newsfragments/2007.enhancement
@@ -0,0 +1 @@
+allow sending emails as user+detail@domain.tld