What could be the problem with partial alerts from vzdump?

Question

KVM

I use automatic backup to back up containers. There are 6 containers on the node. For each separate record for backup. The entries are identical. Three containers receive notifications about successful copying, three do not. What could be the problem?

Answer 1

Check the "Email notification" checkbox in the settings, the value should be "Always"
Well, the postal address should be.
If not, what's in the logs?

Answer 2

Check mail.log