Supports several mail accounts (max. 2 in the free version).
Supports standard Internet mail protocolos: POP3, IMAP, SMTP; as well as Microsoft’s EWS protocol for Exchange.
Main window shows all folders selected for synchronization at a glance.
Messages are loaded one “page” at a time as needed, scroll to bottom to load more.
Supports GMail – like way of working with email, when old messages are never deleted from the server.
Mail check time is independent of the number of messages (my Gmail account has over 100,000).
Supports viewing plain text and rich text messages, including embedded images.
Supports rich text formatting when composing messages including the signature (bold/italic/underline, font size, font color, embedded images, typeface).
Fast attachment loading, attachment cache.
Flexible mail check scheduling.
Sound, LED, vibration notifications for new mail and errors. Per account notification options.
Silent mode for nights and weekends.
Preloads new message text and attachments (up to specified limits) when checking mail. Full message text is loaded on demand, when a message is viewed.
Can load full message text and attachments if put into background (pressing the Home key).
Support for SSL and TLS encryption.
A home screen widget with unread / total message counts that can be set to an account or a specific folder, and a message list widget. Both have several built-in themes.
Separate settings for WiFi vs. mobile network (including a separate outgoing mail server setting for WiFi, if needed).
IMAP: IDLE (push email), instant incoming message notifications (if supported by the server).
IMAP and EWS: messages can be moved between folders.
Smart Folder for quickly browsing messages that might need attention.
Per-folder color indicators.
Message navigation without leaving the message view (two variations on swiping).
Swipe actions in message list.
Swipe navigation between messages.
Android Wear smart watch support.
Calendar sync for Exchange accounts.
Push mail for Exchange accounts (Pro version only).
Contact sync for Exchange accounts.
Message grouping (conversations).