We built some of this functionality for FWD:Everyone, but haven't yet gotten it to a point where it's polished enough to release. One of the issues we ran into is that Gmail translates unicode characters into images, which are then difficult to resize to get them to properly match the surrounding typography.
We also didn't build this as a fully automated service, but rather as something that generates MJML that you then have to compile and embed within an HTML email. But it does let you embed all the replies to an email in a new outgoing email, which you can conceptually see here in this marketing email we sent out:
We also didn't build this as a fully automated service, but rather as something that generates MJML that you then have to compile and embed within an HTML email. But it does let you embed all the replies to an email in a new outgoing email, which you can conceptually see here in this marketing email we sent out:
https://www.alexkrupp.com/fwdeveryone_email_blast.html