We're looking at long term newsletter, marketing automation solutions now. Preferably open source. Mautic came up but there's no Wikipedia article on Mautic.*
I decided to quickly put one up. Alas, I can't stand writing wikitext, it's very slow. I can edit it on other people's articles slowly and carefully. I wanted to write in Markdown so I did. It turns out there are no usable conversion tools. At first I was directed to Pandoc. We've got an online version which handles unlimited characters. I didn't have much success with our version. I tried the official version. No luck there either. Other people were facing Markdown to wikitext Pandoc conversion issues as well.
There's some command line utilities which have to be installed (no thanks) after installing npm first. Or there's online utilities which are no longer available. Finally I was redirected to our own Pandoc converter.