Tuesday, December 7th, 2021: Linden Lab have announced a forthcoming change to e-mail notification preferences in respect of the receipt of Group notices received via e-mail when users are not logging in to Second Life.
To quote the blog post in part:
We will soon be adding an option to email notification preferences. Currently, you can choose to receive IMs in your email when you are not logged in to Second Life. There will now be an additional setting that controls whether you receive Group notices in e-mail.
We are rolling this change out in stages. If you change your settings, it may be up to two weeks before it takes effect.
The default for the new setting affecting Group notices will be OFF. If you wish to receive Group notices in email, you will need to visit the web page and opt in.
This change is motivated by feedback from our community as well as residents frequently marking Group Notice emails as spam. We want emails to our residents to be as relevant and useful as possible.
The ability to opt-in to receiving Group notices can be found on your account dashboard at secondlife.com (there is a direct link provided in the official blog post), under Account → Change Email Settings.
Note that this is an option subject to multi-factor verification when accessing it, and the option includes a check box and dedicated Save button that must be clicked in order to update any changes, as per the image below.

Finally, and as per the comment in red on the Change Email Setting page, and the note within the official blog post, this option must be checked by anyone who wishes to continue to receive Group notices via e-mail when not logged in to Second Life, from December 15th onwards. Also note:
- From December 15th the IM’s to e-mail preferences setting within the viewer will no longer be valid; only the web page options will work to change these preferences. Until the option is removed from the viewer, attempts to use the Preferences option to change the setting will return an IM directing users to the web page).
- This change does not see any change in the current cap on IMs-to-e-mail caps. However, if Group notices are set to off (the default), the cap should only apply to off-line IMs, rather than counting both IMs and group notices.