Having multiple email accounts like most people (including exchange emails for work) Apple mail has been the only email client I've ever enjoyed using since it's not super fancy and doesn't feel bulky or ugly. It's clear which email I'm sending from and works relatively quickly. I also like not having to have another tab in my browser always open just for email and this is one of those cases I'm okay with an application always open like a terminal. I looked into nydus but having to have create another account to access my emails seemed odd to me.