Backups, either successful or not, don't send emails, but able to send emails via CLI. Error "could not render notification template"


New Member
Apr 20, 2023
Fairfax, VA
So, I'm not sure if this is a Proxmox VE issue or a Proxmox Backup Server issue, so I apologize if this is the wrong forum.

After backing up, it shows "Backup job finished successfully" but then it shows:

INFO: target '<group-<>>' is a group, notifying all members...
ERROR: could not notify via target `<>`: could not render notification template: Error rendering "Unnamed template" line 3, col 1: could not render value "195421552640" with renderer HumanBytes

I don't know where it's getting groups from or what's going on.

However, on the PVE I have Postfix set up to relay through MailGun and when I do the command:

echo "Test mail from postfix" | mail -s "Test Postfix"

I receive the email.

I guess I'm not sure who's "responsible" for the notifications... if it's PVE or PBS.

Any help would be greatly appreciated!


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