When you face the issue of your Yahoo Mail filter not working on, then there are specific steps which the user can take up in order to solve this malfunction. The steps which need to be followed are:
•Check whether you have created an empty filter or a filter without any rules.
•It is also suggested that the users do not use conflicting filter rules for their spam filters.
•Certain times when the users use multiple criteria, they could come across this error.
•When the users set filters for other folders, then it would block your email client from downloading them.
If you are unable to solve this issue, then the best alternative which the users must take up is to connect with Yahoo customer service phone number. This service is available throughout the day and is completely free of charge.