I have 10 e-mail addresses I use day-to-day and I access them all in Mozilla Thunderbird through IMAP. I haven't found a webapp anywhere near as straightforward

I have 10 e-mail addresses I use day-to-day and I access them all in Mozilla Thunderbird through IMAP. I haven't found a webapp anywhere near as straightforward and efficient as a simple desktop mail client. I definitely don't want to log in to 10 different web apps to check my mail, or even log in to one and sequentially click a "switch account" button and cycle through things.