I've used Pure360 in the past and it gave me the ability to see whether people viewed the html version or the text version.
Does something similar exist in the Campaign dashboard once a blast has gone out?
Thanks for any pointers
No you wouldn't be able to determine this. I'm not sure how anyone could. Tracking opens requires HTML and a plain text version, by definition, doesn't support HTML.
So this isn't something we can do and, as far as I know, there isn't a way to do this that would be accurate or reliable at all. I would be skeptical of anything claiming to track plain text opens.
I hope this helps. Have a good one, Darren! :)
// Erica M | Support Admin