diff --git a/imap_filter/imap_filter.py b/imap_filter/imap_filter.py
index 19ab795..8a132d7 100644
--- a/imap_filter/imap_filter.py
+++ b/imap_filter/imap_filter.py
@@ -66,6 +66,12 @@ class ImapFilter:
     def _process_filters(self):
         matches = 0
         for mailbox in self.config['mailboxes']:
+            if 'mailbox' not in mailbox:
+                self._log.warning(
+                    "No mailbox name in %s, skipping.",
+                    mailbox
+                )
+                break
             if mailbox['mailbox'] == 'INBOX' and self.config['sieve_scripts_path']:
                 self._create_sieve_script(mailbox['filters'])
             self._log.debug(
@@ -220,6 +226,7 @@ class ImapFilter:
                     mfilter['name'],
                     mfilter
                 )
+                return {"match": False}
         match = re.match(regexp, field_data)
         if match:
             self._log.info(