Crazy Mac Mail.app window sizing problem

alphadork wrote:

I'm running Mail.app 16.0 on a Mac Studio running Ventura 13.3.1, with a three-display setup (two horizontal, one vertical between the other two). Every time I open a NEW message (whether using command-N, or the icon), the new message window is insanely wide - wider than the display. All the resizing arrows show up if I hover at the edges and corners, but they do not function to narrow the window. I can make the window shorter, but that's not the problem; I cannot make it narrower. Using full screen, entering and then leaving full screen mode, restarting the computer, quitting and restarting mail.app, all make no difference whatsoever. This problem only happens (and, sadly, always happens) on this computer. It's driving me nuts.

I suspect this has something to do with one of your Signatures... forcing the window larger.

Try removing the signatures/disabling sig what ever it takes... and compare your results.

Something in the formatting as is.

Create and use email signatures in Mail on Mac - Apple Support

I have the same problem using mail from my Macbook Air, but it happens in some of the email accounts that are configured on the app. Would you find any solution to the problem?