Number of spam messages not growing
The number of spam messages remains unchanged for a long time.
You notice that the amount of spam messages remains the same even though it should grow steadily. This indicates a problem in the Network Configuration settings.
To solve the problem, you should check that you have specified the Internal Domains and Internal SMTP Senders settings:
Go to Web Console
> Network Configuration
For more information about how you should change the settings, click Help in the user interface.