I don’t understand an error.
My settings are that every user get a weekly summary if he don’t come to the forum (recommanded settings)
It works but not for everyone
This user didn’t change her personal settings and she don’t recieve the summary
Last mail recieved : 23 days
Last visite the forum: 12 days
And there are new topics
Did I miss something?
I think each user can choose if they want the summary, or do not want it. From my preferences here on this forum:
It’s mentionned that:
But that may be ambiguous, if the default setting was not having summary enabled for users 
As show picture 1, I let the recommanded settings : weekly summary for everyone
Is it another general setting somewhere?
Two settings in total I suppose, that you mentioned in your post:
And
So, site settings, and individual user settings (which you can see in their profile as an admin).
Are the summaries correctly sent to other users? /admin/email/sent
Did the user check the spam folder? Do they receive other emails like notifications?
Is there anything suspicious in /logs, just in case?
As I see, here admin/email/sent users get the messages. I can’t check all but there are many
Discourse send only 1 mail 23 days ago to this user and she recieve (and open) it. It was not in the spams
Nothing special in the logs
