Ok, I tried sharing a file with the same attribute. I have waited for more than 15 minutes, and haven’t received an email.
the server log
Level : info
Logger : pydio.grpc.tasks
Msg : Run Job users-activity-digest on timer event Iso8601Schedule:"R/2012-06-04T19:25:16.828696-07:00/PT15M"
Ts : 1729585467
SpanUuid : span-4
Level : info
Logger : pydio.grpc.tasks
Msg : Run Job flush-mailer-queue on timer event Iso8601Schedule:"R/2012-06-04T19:25:16.828696-07:00/PT5M"
Ts : 1729586068
SpanUuid : span-0
Those are the latest logs after waiting for above 15 minutes.