diff --git a/backup_imap/backup_imap.py b/backup_imap/backup_imap.py
index e9e567f..c438563 100644
--- a/backup_imap/backup_imap.py
+++ b/backup_imap/backup_imap.py
@@ -61,6 +61,14 @@ class BackupImap:
         self._process_mailbox(self.config['mailbox'])
 
     def _process_mailbox(self, mailbox):
+        self._log.debug("Searching for all mailboxes in mailbox '%s'...", mailbox)
+        list_response, list_data = self.imap.list(f"\"{mailbox}\"", '*')
+        if list_response == 'OK':
+            for subdir in list_data:
+                sub_mailbox = self._parse_mailbox(subdir)
+                if sub_mailbox != mailbox:
+                    self._process_mailbox(self._parse_mailbox(subdir))
+
         self._log.debug(
             "Seleting mailbox '%s'",
             mailbox
@@ -143,13 +151,6 @@ class BackupImap:
                                 message_path,
                                 error
                             )
-        self._log.debug("Searching for all messages in mailbox '%s'...", mailbox)
-        list_response, list_data = self.imap.list(f"\"{mailbox}\"", '*')
-        if list_response == 'OK':
-            for subdir in list_data:
-                sub_mailbox = self._parse_mailbox(subdir)
-                if sub_mailbox != mailbox:
-                    self._process_mailbox(self._parse_mailbox(subdir))
 
     def _parse_mailbox(self, data):
         result = data