Reviewed in just the best - fcuk the rest...
highly acclaimed new 3rd party email app that supports gmail, imap, outlook, exchange, icloud and more. additionally it has a unified inbox that combines all your mail into one place and can integrate with tools like pocket, evernote and others. the free version is fully featured, it only limits you to five mail accounts.
Reviewed in Email Clients for Android
CloudMagic specializes in cloud search and this shows in its email application. It can handle multiple email inboxes, like a regular email but it can also search through them. The interface is not very inspiring but is clean. The number of email accounts is limited to five, which should be enough for most people.