longest email i have is 13 messages total.

when i view it, it lists the original sender's name, then has grey lines for each message between (no text), then shows the last two people who sent. it compacts it enough so i don't have to scroll.

if i click on any of the grey, the expand and show who sent it in the email and the first line. still small enough not to scroll.

i don't know how large your emails are