diff --git a/modoboa/webmail/lib/imaputils.py b/modoboa/webmail/lib/imaputils.py
index 120de33c8..44435d27d 100644
--- a/modoboa/webmail/lib/imaputils.py
+++ b/modoboa/webmail/lib/imaputils.py
@@ -1,7 +1,6 @@
 """Extra IMAPv4 utilities."""
 
 import email
-from functools import wraps
 import imaplib
 import re
 import ssl
@@ -19,7 +18,7 @@ from modoboa.parameters import tools as param_tools
 from ..exceptions import ImapError, WebmailInternalError
 from .fetch_parser import FetchResponseParser
 
-# imaplib.Debug = 4
+imaplib.Debug = 4
 
 # workaround for the "got more than 10000 bytes" exception. MAXLINE
 # value set to 1M, as on latest python versions.
@@ -28,29 +27,6 @@ if hasattr(imaplib, "_MAXLINE") and imaplib._MAXLINE < MAXLINE:
     imaplib._MAXLINE = MAXLINE
 
 
-class capability:
-    """
-    Simple decorator to check if the server presents the required
-    capability. If not, a fallback method is called instead.
-
-    :param name: the capability name (upper case)
-    :param fallback_method: a method's name
-    """
-
-    def __init__(self, name: str, fallback_method: str):
-        self.name = name
-        self.fallback_method = fallback_method
-
-    def __call__(self, method):
-        @wraps(method)
-        def wrapped_func(cls, *args, **kwargs):
-            if self.name in cls.capabilities:
-                return method(cls, *args, **kwargs)
-            return getattr(cls, self.fallback_method)(cls, **kwargs)
-
-        return wrapped_func
-
-
 class BodyStructure:
     """
     BODYSTRUCTURE response parser.
@@ -411,45 +387,6 @@ class IMAPconnector:
             sdescr["class"] = "subfolders"
         return True
 
-    def _listmboxes_simple(
-        self, topmailbox: str = "INBOX", mailboxes: Optional[list] = None, **kwargs
-    ) -> None:
-        # data = self._cmd("LIST", "", "*")
-        if not mailboxes:
-            mailboxes = []
-        (status, data) = self.m.list()
-        newmboxes = []
-        for mb in data:
-            flags, delimiter, name = self.list_response_pattern.match(
-                mb.decode()
-            ).groups()
-            name = bytearray(name.strip('"'), "utf-8").decode("imap4-utf-7")
-            mdm_found = False
-            for idx, mdm in enumerate(mailboxes):
-                if mdm["name"] == name:
-                    mdm_found = True
-                    descr = mailboxes[idx]
-                    break
-            if not mdm_found:
-                descr = {"name": name}
-                newmboxes += [descr]
-
-            if re.search(rf"\{delimiter}", name):
-                parts = name.split(delimiter)
-                if "path" not in descr:
-                    descr["path"] = parts[0]
-                    descr["sub"] = []
-                if self._parse_mailbox_name(
-                    descr["sub"], parts[0], delimiter, parts[1:]
-                ):
-                    descr["class"] = "subfolders"
-                continue
-
-        from operator import itemgetter
-
-        mailboxes += sorted(newmboxes, key=itemgetter("name"))
-
-    @capability("LIST-EXTENDED", "_listmboxes_simple")
     def _listmboxes(self, topmailbox: str, mailboxes: list, until_mailbox=None) -> None:
         """Retrieve mailboxes list."""
         pattern = (
diff --git a/modoboa/webmail/tests/test_viewsets.py b/modoboa/webmail/tests/test_viewsets.py
index 2659fc347..1a724904c 100644
--- a/modoboa/webmail/tests/test_viewsets.py
+++ b/modoboa/webmail/tests/test_viewsets.py
@@ -49,6 +49,8 @@ class IMAP4Mock:
             self.untagged_responses["LIST"] = [b'() "." "INBOX"']
         elif name == "NAMESPACE":
             self.untagged_responses["NAMESPACE"] = [b'(("" "/")) NIL NIL']
+        elif name == "STATUS":
+            self.untagged_responses["STATUS"] = [b"STATUS INBOX (UNSEEN 10)"]
         return "OK", None
 
     def append(self, *args, **kwargs):