I messed around with a few email tools last (as part of updating emails in our rails app).
I tried MJML, Zurb, and a few others. I ended up settling on Cerberus:
http://tedgoas.github.io/Cerberus/
I'd probably use MJML if I had to do this kind of stuff day-in, day-out. But, for just getting a few views in order, I much prefer just copy, pasting, then adjusting from a few blocks.