Delete spam without downloading HTML content
Allow deleting of messages from the messages list without loading the content into the detail pane. I can usually tell marketing spam from the snippet in the messages list, but cannot delete it without Airmail loading the full message, including dynamic content that lets the spammer know I'm a real person. MS Outlook provides a delete button for each message in the list, and clicking on that button deletes the message without loading its contents.
And yes, I know I can turn off "Autoload Remote Images" in Preferences/Appearance, but then it affects all the email that I DO want to read.

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Hank Hagquist commented
YES! This is something I really miss that is in Sparrow.