I could not find this feature at all. I understand that when Plex has an available update it tells you in the browser window. However, I would really like to get an email, text, etc. When ever an update is available, because I am not always checking my Plex Server every single day.
If this is already a feature please do tell. Or if there is a plugin that does this I would love to know that as well.
Early 2021 clean-up: implemented (in-app notifications, mobile notifications, option to get alerts by mail from the forum -> release announcement category…)