Thanks for the detailed reply. I've outlined the purpose of the system briefly here: https://news.ycombinator.com/item?id=17798756 https://news.ycombinator.com

Thanks for the detailed reply. I've outlined the purpose of the system briefly here: https://news.ycombinator.com/item?id=17798756 https://news.ycombinator.com/item?id=17798756 I think attachments would be almost a requirement, given that users would need to pass manuscripts backwards and forwards (although I suppose encouraging people to use google drive instead is not out of the question). I had a look at Discourse, but it seems heavily geared towards forums rather than 1 to 1 email. Your other suggestions require a bit too much development for my skill levels (I'm a sysadmin, not a dev).