App Name: MailDroid [Android Email App]

Cost: Free

Developer: Flipdog Solutions

App Market: Download Page

Description:

MailDroid is a Webdav/POP3/IMAP Idle Push mail client application.

It is also a secure mail app supporting PGP, PGP/MIME and sMIME. The app also have a custom spam plugin for people that want a client side spam checker. MailDroid supports multiple email accounts for your email management (as many as you like with no limitation on mail accounts). There is also a pro version that is ad free that adds a few additional features.