But the real problem is that unread item count is coupled to the emails being sent out, https://gitlab.com/gitlab-org/gitter/webapp/issues/1205. So if you have notifications set to "All" or "Announcements" which track unreads, you will get emails for any unread messages in the room which isn't desirable.
If you want to stop email notifications, https://gitlab.com/gitlab-org/gitter/webapp/blob/develop/doc...
You could also adjust your notification settings to "Mute", https://gitlab.com/gitlab-org/gitter/webapp/blob/develop/doc...
But the real problem is that unread item count is coupled to the emails being sent out, https://gitlab.com/gitlab-org/gitter/webapp/issues/1205. So if you have notifications set to "All" or "Announcements" which track unreads, you will get emails for any unread messages in the room which isn't desirable.