When adding comments to a New Item, if you use @everyone (see image) it will send your comment to everyone on your System including Guests and Viewers. In our case and I’m sure for many others, that includes customers and other agencies, which is perhaps the intended behavour but not the expected or ideal one.
The Everyone group is a Monday default and any user of the Board can access it. There is no way to disable it…
Please put some controls around this feature.
Thanks