There are a variety of reasons for your Yahoo Spam Filter Not Working properly. If you build a filter with no rules (i.e., an empty filter), it will send any messages to the inbox that contain an empty character. When this filter is applied on top of other filters, it nullifies their rules and sends all emails to the inbox. Alternatively, if the rules are incompatible, you'll encounter this problem. The use of both positive and negative terms together is an example of conflicting norms.
Ron MHow can I fix the Outlook Not Receiving Emails issue?
Before attempting to resolve the problem of Outlook Not Receiving Emails, check in the Junk Folder, not the same as the Spam Folder. Make sure you've checked your Outlook Junk folder before taking any drastic measures. It's conceivable that you got the email but Outlook marked it as junk. Simply click on the outlook message, click to Actions > Junk Email, and mark it as non-junk. This will move the email to your inbox and prevent the same behavior from happening again for the same email address.