Newton Mail

CloudMagic is a mail management tool that works perfectly with Gmail, Exchange, Yahoo, Outlook, or iCloud, and lets you sync up to five IMAP accounts.

With CloudMagic users will have just one inbox for all accounts, even though you can also create as many inboxes as you like. In any case, the search tool allows you to find any email in just a few seconds.

Another of CloudMagic's interesting features is its integration with work tools such as Zendesk, Pocket, Evernote, OneNote, and Trello, which you can run from the interface itself to save time.

CloudMagic's offline feature allows you to access your inbox and look over the previews of your emails even if you aren't online at that moment. You can also password-protect your inbox.

CloudMagic is an excellent mail manager with many available features and is even capable of competing with the ubiquitous Gmail App for Android.