While composing a mail, the Yahoo categories used to appear in the autocomplete list when few characters of same were typed until Zimbra's build 1537.

However, after updating to latest build 1593, Yahoo categories no longer appears in the autocomplete list when first few unique characters for the category are typed.

When I checked the same in Yahoo mail in browser, it still works like before.

Any idea on how to resolve this ?

This is useful to send mails to distribution list.