¿No se puede configurar email-in para un grupo existente?

[Architect]

Yeah for one of the automatic/default groups, from the guide thought that would be possible for an “exsting group”:

@Discourse

If you are editing an existing group, click the group’s Manage tab, then click the Interaction link from the left side menu. You should see a Custom incoming email address field near the bottom of the form:

Can create a new group instead, maybe note could be added to this guide about that not being possible for the default groups.