Please post a screen shot, and describe your computer's display.

Thanks Wayne but I cannot take a screen shot. In the normal email frame, only 120 characters are visible. The rest cannot be seen except in full screen because there is no r h margin.

I am aware that some emails do not line wrap. Generally they original from an apple product. I am aware that some pasted content does not line wrap.

I do not see a "margin" in either V102 or later so like Wayne, I can not visualize what you are saying.