The trouble with standard mobile email apps is one of translation. These are all pretty much desktop email platforms tweaked for mobile, and it shows.
Boxer is an app that makes mobile email more . . . well, mobile. You can use it to aggregate multiple email accounts, centralize archiving, and more closely tie email to other productivity tools. Through an open integration platform, Boxer intends to extend the power of mobile mail through integrations with other common mobile tools, such as Box, Dropbox, LinkedIn, Salesforce, Evernote, and Facebook.