fix: [module extractor] limit email extraction

Author: Terrtia

bin/modules/Mail.py

@@ -135,7 +135,7 @@ def check_mx_record(self, set_mxdomains):
     def extract(self, obj, content, tag):
         extracted = []
         correls = obj.get_correlation('mail').get('mail', [])
-        if correls > 150:
+        if len(correls) > 150:
             return []
         for m_id in correls:
             m = Mails.Mail(m_id[1:])