Multiple Mailboxes
I used to be able to view all my mailboxes (I have 4) using 1 login account by adding additional mailboxes feature. The instructions say to add them in the app (and I have) and I should be able to see them on the web, but it's like the 2 are not connected at all. This has since been removed from the web version so now I have to log into each email individually to view my email. All mailboxes are showing in the app, but not on the web. You used to be able to add additional mailboxes, but the "Yahoo Mail" is no longer an option. You can add GMail or Oulook, but not your own emails? Please bring this feature back!

Hi, we'd like to hear more about this issue. Could you please contact us at help.yahoo.com so we can look into it? We're also available on Twitter @YahooCare.
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David Levasheff commented
On the top left there is an area under the Compose button where email accounts are listed. With my main cox account I was able to add my pre-existing Yahoo mail account so that I can easily switch between accounts. Problem is I had three other cox accounts moved to Yahoo as well. but your (when clicking on the gear next to the mail box name and opening a settings tab) Mailbox List dialog area won't allow another cox account to be added to the list. I try add yahoo and the @cox.net is not valid. I try Other and I get no where there either. (This is all on windows browser interface). You need a way to allow cox.net mail boxes to be added to the Mailbox List area under the compose button.