What are filters?
Explains how to create filters, to organize your Yahoo! Mail
If you want your email messages to be automatically sorted into different folders as they arrive in your inbox, use Yahoo! Mail’s filtering feature. Filters Rules that Yahoo! Mail uses to direct an incoming message to a particular folder automatically sort your incoming messages according to rules that you set up. For example, you can create a filter so messages from your child’s school are automatically delivered to a personal folder called School. With filters, you don’t need to read through each message to decide where it goes and then move it there yourself.
You can create up to 100 filters (200 if you’re a Yahoo! Mail Plus user). If you use more than one filter, you may need to specify the order in which Yahoo! Mail tries to apply your filters.
For information on setting up filters, please click here.