Sure thing.

Here's some more:

You can open any number of the menu options and the previous ones don't close. https://i.imgur.com/NxKVk6W.png

Additionally, there doesn't appear to be an exit icon on any of them, though escape works.

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Accessing my spam folder freezes the app and results in the following stack trace: https://i.imgur.com/HkNbH67.png

The message in the thread in question doesn't have a from attribute.

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Finally, using ctrl+c (to copy) in an email you're composing will open a new composition window. Might be best to disable that in an active text input or if text is selected.

Edit: Also, a 'mark all as done' button like Inbox had would be greatly appreciated.