moderated Re: #hashtags
Since hashtags cant really do much when they are in an email subjectThat's the only place they do anything, in Groups.io.
After all, they are not relevent at an email level... at least with myOh, but they might be, to any of your group members. See the following:
Another option could be to let the user subscribe to only certainThat part exists. See the description of *Following Only* in the help:
Or look on your Subscription page, in the Advanced Preferences section.