Why are notifications from Let's Encrypt received when SSL/TLS support is disabled at Domains > example.com >Hosting Settings?
Let's Encrypt extension is using delayed notifications.
Even when the SSL/TLS is disabled, the notifications can still be sent for a few days, while they're stored in the "pending" state in the database.
To check the state of notifications in the database follow the next steps:
Connect to the server via SSH.
Access the Let's Encrypt database:
# sqlite3 /usr/local/psa/var/modules/sslit/sslit.sqlite3
Run the following command to check last 10 notifications and their state:
select id,createdDate,state,params from Notification where params like '%example.com%' order by id desc limit 10;
Note: replace example.com with the required domain name.