Add the standard OSX menubar item: "Window > Zoom"

Practically every Mac app ever has had this menubar item. I don't understand why Airmail developers would remove it or not include it.

With every app I use, I know I can count on the CMD+Shift+Z keyboard shortcut (set in System Preferences > Keyboard > Shortcuts) to re-size an app's window size between my preferred max & min sizes.

But with Airmail, I have to either manually resize the Airmail app, or ALT+Click the green window button (which I never do), or find some loophole in BetterTouchTool… but nothing works and/or nothing's easy.

PLEASE ADD THIS STANDARD OSX FEATURE.

It isn’t some impractical idea that would create bugs in Airmail. It’s a pretty easy feature to add.