I too want to be able to insert modules. I have all the StackIdeas components (EasyBlog, EasySocial and EasyDiscuss) and would like to be able to add things like latest videos, latest audio etc. It used to be so simple in Acymailing 5 but has nowhere near the same features now in Acymailing 8. We used to be able to apply filters as to what was included (by category, latest, mospt popular etc.) now we have to select them manually and they don't display as well as they used to.
I'd like the ability to add modules so I can set what content will be displayed. I did try using RegularLabs ModulesAnywhere but it doesn't work with AcyMailing (I was told it was because AcyMalying doesn't use com_content). I did try adding a module to an easyblog article using Modules Anywahere or Joomla's built in module displayer. They show properly in EasyBlog but when I add it to Acymailing it just shows the tag.
This content is my main reason for sending out emails, now I have to spend a huge amount of time setting the email up as have to add everything manually to get it looking right.