Oh, well, Zoho Mail may provide many features similar to Google, but it's in no way ready for prime because of reliability. There are several quite obvious buggy aspects (read the most popular threads on their forums) that trail for months to years, and that they still manage to ignore or refuse to fix. Hold your horses and experiment to see if it fits your needs before definitely switching to Zoho.

Zohomail itself is full of useful functionalities such as having your domain own email, planning delivery, filters, etc BUT it comes with a bunch of Zoho applications which makes its usability poor and slow when you don't need integrated CRM, chat, etc..
It's not only visual (these can't be hidden from your screen) but also makes everything like a real labyrinth.

Zoho Mail provides a robust admin console to manage business emailing in every aspect. With Zoho, Email hosting and emailing is a breeze .. Its simply a great email experience. with templates. vacation reply and signatures, it provides a professional email client comparable to Outlook and yet at a very reasonable cost

Zoho Mail is sofar the best alternative that I found to Gmail. It emulates most of Gmail's functionality, is accessible via POP/IMAP and offers unlimited storage space. The interface is clean, provides integration with various other Zoho services, is ad-free and has a very helpful support service.