Our PRTG email notification suddenly stop working. This is the error, please help. Error sending "Email": Authentication unsuccessful ("smtp.gmail.com") (Sensor/Source/ID: 2433/0/1)
Email notification error
Modified on 2025-06-10 12:13:08 +0200
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The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
Hello,
It sounds like you need to check the SMTP Relay options by going to Setup -> System Administration -> Notification Delivery.
Make sure the credentials you have entered into PRTG to use GMail to send emails is correct.
Let me know how that works out for you
Benjamin Day
Paessler Support
Feb, 2019 - Permalink