AquaMail is an email app for Internet and Exchange mail, for Android 2.1 and higher.
Easy automatic setup for popular email services: Gmail, Yahoo, Hotmail, FastMail, Apple mail services (@me.com / @mac.com), GMX, AOL, and more. Recognizes mail accounts at domains hosted by Google Apps, Yahoo BizMail, and others.
Works with many other email services via standard Internet email protocols (IMAP, POP3, SMTP) as well as Microsoft’s EWS (Exchange Web Services) protocol.
Microsoft Exchange is supported via IMAP or EWS. EWS includes access to server side contacts (personal and global, with lookup), and accepting meetings that can later be viewed in Outlook and other apps.
Easy automatic setup for Office 365 and Exchange Online.
Push mail for IMAP (instant incoming email delivery) for those servers that support the IDLE extension (Gmail, GMX, AOL… not supported by Yahoo).
Plays well with other email apps that you may be using to access your IMAP or EWS mailbox. Uses existing folder structure, can synchronize drafts, sent, and deleted messages.
Widgets (message counts, message list).
Swiping in message list (actions) and between messages (both new in 1.5.0, which is in a staged rollout, not visible from every device yet).
Can save attachments on the memory card.
Message auto-fit (like in Gmail) on Android 4.0 and above.
Rich text formatting when writing messages (including embedding pictures).
Android Wear (4.3+).
OAUTH2 for Gmail.
Integration with Tasker (change settings, trigger mail check, message based events).
Integration with Light Flow, Enhanced SMS & Caller ID, Cloud Print, Apex Launcher Pro, Nova Launcher / Tesla Unread, Executive Assistant, DashClock Widget.
+ “Send later” (Menu on the compose screen).
+ Combined drafts folder.
+ Big changes in message view: attachments below or above message text without side swiping, larger previews.
+ Reworked “message auto-fit”: not only zooms out, but also adjusts content (results depend on actual message) and adjusts font size.
+ Perfect score at EmailPrivacyTest.com (with “show linked images only from known”, which is the default).