Thanks, all.
First, yes, I also have suggested attaching instead of embedding huge image files, but alas to no avail.
I get email via gmail not via website.
As to right-clicking, it's not the image that's the problem, it's the surrounding text.
And I try reducing the page size but some images are so big that when all fits onto my 42" wide screen the text is too small to read comfortably.
I've taken to deleting such messages without reading them. Again, high-def gaming monitor (LG, cost me a cool $1K in 2016 or so.)
Patrick "damned kids, get off my lawn" Moore