ProfiMail is email client offering many interesting functions, and it is provided completely for free.

Features:

● Folders tree hierarchy - see all accounts and their folders in a tree view
● Signatures - add your signature to composed message, automatically or manually
● Rules - conditions and actions applied automatically on incoming messages
● S/MIME cryptography - mail encryption and digital signatures
● Combined folder - see messages from multiple folders in one place
● Conversations and Threads - see related messages in a conversation in a tree view
● Rich text message composer - add images, colors and smileys to your messages
● Widget - see new messages on Home screen or lock screen
● Multiple panes - see more on large screens
● Full-text search - find any message on your device
● Integration with X-plore - uses our free file manager for working with images, sounds, and other files
● Tight integration with Android - make calls, open websites, share content, whatever
● Fully automatic or manual work - check mail any way you like
● Push mail - using IMAP IDLE to connect to any IMAP folders that you wish
● Configurable - you choose how much/what/when to download and how to be notified about it
● Attachments - shown in nice list, with icons, images with thumbnails
● Works in background - you can do other tasks while mail is downloaded or sent