Adding filters in old Webmail
Adding filters in old Webmail was simpler and besides restrictions such as length of autoresponder have been added.
Jennifer Gendler commented
I agree. It was easier to create filters in Old WebMail and I switch to it in order to manage or create new. In fact, when I try to create one in the New WebMail, it only lets me set one parameter (such as From, To, Subject, etc.) and Old WebMail let me do multiple criteria. Also, in New, the GUI seems to cut off at the right when I select the action of what to do with the email—perhaps that's why I can't have full control over the parameters.