Added in 0.7.1: Adjustable Mail List Density: Two new sliders in Settings → Appearance → Email List let you fine-tune how compact the message list feels
"Vertical padding" (0-16 px) controls the top and bottom spacing of each message row
"Divider thickness" (0-4 px) controls the line between rows, with 0 hiding the divider completely
Changes apply live to the open mail list without restarting the app