K-9 Mail is what you get when you take the default Android email client and make it, erm, better. It made the jump this week to version 4.4 and now sports a more holo-themed user interface, rich notifications for Android 4.1+ devices, an altered unread widget, and a whole bucket-load of nitpicky features that may or may not make your day, depending on how anal you are about how you like your email. If the Gmail app just isn't cutting it, this is a solid open source alternative that looks great on both phones and tablets.
When it comes to email clients, it's the little things that can be deal breakers. Determining which changes are the most impactful is akin to finding a needle in a field of haystacks. The changelog is long, but your pet peeve may have made the list.
Miscellaneous
Notifications
Options
Composing mail
Forwarding mail
Reading mail
Folder list
Widget
Protocol support
Localization
K-9 Mail is one of the most feature-rich email clients you will find on Android. It's available in the Play Store for free, so hit up the widget below to see if the new version meets your needs.
[EMBED_APP]https://play.google.com/store/apps/details?id=com.fsck.k9[/EMBED_APP]
Source: GitHub