What's a good Android app for managing multiple email accounts, especially when some are used primarily for research and others for university communications?

Yahoo Mail presents an interesting implementation of a unified inbox, something I find particularly helpful for segregating my research correspondence from university-related emails. The ability to manage multiple accounts within a single application is a novel approach to an old problem, and the algorithm is surprisingly elegant in how it sorts and filters messages. I appreciate that it's available across platforms; I can access it on my Android phone, my tablet, and my desktop without losing any functionality. This is particularly useful when I'm working on collaborative research projects and need to quickly reference information from different sources. It also simplifies managing citations and research materials, which are often sent via email. The well-researched design makes it a pedagogically sound choice for anyone managing multiple email streams.