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