Logs for e-mail notifications

Hi,

today I was wondering why I did not receive an e-mail for a failed backup. So I went to the Notifications configuration to test the notification target with the "Test" button. It asks "Do you want to send a test notification to 'mail-to-admin'?". I click "Yes".

Then I get an error popup saying "Could not test target: could not notify via endpoint(s): mail-to-admin: Invalid input (500)".

Where are the logs for this, so I can debug what "Invalid input (500)" means? This error message...

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