Probably going to sound like a smartass answer, but could you not View as Webpage and either a) share the link b) print to PDF ?
Not snarky at all! Just wanted to see how others are tackling this annoying nuance.
I considered the "View Webpage" links but wasn't sure how long the "View in Webpage" links would be active so was a little leary... exporting to PDF from View in Webpage is probably my best bet to maintain the integrity of the email and ensure the links always work.
Other suggestions still welcome from others!!
I use Chrome and will usually grab the source code directly from the preview. Just right-click and choose "View frame source".