Because risky messages arrive quietly, 1krBlocker sends one summary a day: Every day at …, if anything was kept away It says how many messages were held back, so you can look through quarantine when it suits you.
Change the time: Settings → Daily summary.
No summary on a day means nothing was kept away. If it never arrives, check that notifications are on for 1krBlocker (see "Notifications are off") and that the summary channel isn't turned off in Notification sounds and channels.