Line Spacing of Source Code

Hey gang,
I thought I saw a reference to someone else having this issue a while back experiencing multi-line source code examples in their mail apps with 1/2 the line spacing. I see the same crushed source code text in iOS 13.3.1, Snow Leopard and Catalina on Apple Mail. It's maddening. I have googled the problem on and off for the past several months but I can't figure it out.
Going to online gmail account seems to work flawlessly but I'm lazy and I want to see my mail in my local mail app (Apple Mail).
I figure this is on topic because it is hindering me (slightly) from "Using Swift" but I don't post much so I might be wrong.
-Michael

I thought I saw a reference to someone else having this issue a while back

Is this the thread you’re looking for?

Not exactly - it was a more subtle one. Like an offhanded "this crushed text isn't any fun". But thanks, this is better. I feel less crazy that someone else has the same problem. I've looked the raw source code for the mail app and the program doesn't seem to be able to render the html:
(3x backticks)swift
*code with bad line spacing
(3x backtracks)
Thanks again!