What irks you about email?

Hi HN,

I am working with a team of hackers on an app seeking to redefine the mobile email experience, and finally eliminate the obsolete concept of an inbox. As we're getting ready for alpha testing of our prototype, here's a question for you that I'm sure many will have an answer to ready on their mind: what irks you most about email on your phone? And, in an ideal world, how should that aspect of mobile email be changed?