Yahoo spam filter is pretty much useless against spam/phising emails. The spam/phising emails are usually sent using random email addres where yahoo spam filter settings can't handle them.

Suggestions to improve yahoo filter settings:
1) Add "From" label filter.
The apple spam emails are usually using From label "Apple Notice", but the From filter can only filter From's email address, which is pretty much useless in my case the spam email address are random.

2) Add regex support for the filter settings.
Currently the supported filter settings are "contains", "does not contain", "begins with", "ends with". These are not enough for some spam emails.

3) Add filter setting to filter emails with attachment and without body contents.
Spammers like to send you no-contents email with only attachment.

4) Add filter setting to filter From's email address with certain characters length.
The spam emails are usually using very long email address, so it will be useful if there is setting to filter emails by email address length.