You could just try to send an email via cli e.g.
# mail -s "Test" user@example.com
vzdump --mode=snapshot --quiet=1 --mailnotification=always --mailto=me@example.com --node=node1 --storage=backup --compress=zstd 101
Actually there is an option to test the notification system with Proxmox VE 8.1.3I also found myself in need of a way trigger a noteworthy event without actually bringing anything down. In my case, backups notifications are working, but not disk errors, they seem to be on separate channels.
PVE should include a way to test notifications. Nothing works until they are tested to be working.
The test button helps to test the notification channel, but is does not help with testing if the notification works if something breaks.Actually there is an option to test the notification system with Proxmox VE 8.1.3
Under
Datacenter > Notifications > Notification Targets
you can specify how to notify and in the Taskbar is a Button "Test" which tests the selected notification option.