compliments for ZOHO mail - and thanks for the free version. It is a great product. I switched from gMail to ZOHO and enjoy it.
I suggest to add the following feature:
When a user (MAIL) creates a filter, he can select that the filter shall be applied to the INBOX (or any other folder) after saving it. In order to prevent mistakes a "preview" of the filter functionality would be good.
A general possibility to apply a filter to any folder would also increase user friedliness.
Best Regards,