If you’are in need of an Android app which you can use to manage more than one email account, then you need to download K9 Mail app from the Google play store.
K-9 Mail is an open-source e-mail client with search, IMAP push email, multi-folder sync, flagging, filing, signatures, bcc-self, PGP, mail on SD & more!. It supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).
K9 app lets you fully control your email accounts. There are advanced settings eg, you can set how often to fetch your mails, the number of mails to display, whether to auto sync your mails or not etc
Download K9 Mail for Android and Blackberry
You can download K9 Mail app for Android from Google Play store.
You can as well download k-9 email client for Blackberry 10 from the Blackberry App world.
If you need K9 Mail apk, search for it at 1mobile.com