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It's easy to forget to add more recipients when you're answering to a mail list. So instead of replying to the whole list, you end up responding to a single email address.

Allow selecting of multiple messages / conversations to delete or move them en masse.

There are a lot of links in emails. You cannot trust that they go to legit destinations. In Hiri you cannot see where they go the way you can in a browser when you roll over the link.