The true email address of any user of Nabble software is obscured automatically , so you have no worries. (Logon as a user with non-Administrator permissions to confirm this.)
Obviously, it would make many forums unusable if Nabble detected and obscured mail addresses in the body of messages. Wouldn't you want children to see where they should write to for vital information on your forum?
And what do you propose about those who post invalid but human readable address such as "me at mydomain dot com" to avoid having an address harvested by robots?
Perhaps I misunderstand your question?
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.